Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Unsecured Revolving Credit Facility and Other Notes Payable Debt Disclosure [Text Block] Payables and Accruals [Abstract] Warranty accrual(1) Standard and Extended Product Warranty Accrual Accrued compensation and benefits Accrued Salaries Accrued interest Interest Payable Completion reserve Completion Reserve Completion Reserve Income taxes payable Accrued Income Taxes Deferred profit from unconsolidated joint ventures Deferred Revenue Other accrued expenses Other Accrued Liabilities Total accrued expenses and other liabilities Accrued Liabilities and Other Liabilities Receivables [Abstract] Contracts Receivable: Contracts Receivable [Abstract] Costs incurred on fee building projects Contracts Receivable, Costs Incurred On Fee Building Projects Contracts Receivable, Costs Incurred On Fee Building Projects Estimated earnings Contracts Receivable, Estimated Earnings Contracts Receivable, Estimated Earnings Contracts receivable, before collections Contracts Receivable, Before Collections Contracts Receivable, Before Collections Less: amounts collected during the period Contracts Receivable, Cash Collections Contracts Receivable, Cash Collections Total contracts receivable Accounts Receivable, Net Billed Billed Contracts Receivable Unbilled Unbilled Contracts Receivable Other receivables Other Receivables [Abstract] Other Receivables [Abstract] Escrow receivables Escrow Receivables Escrow Receivables Other receivables Other Receivables Contract and Accounts Receivable Accounts and Notes Receivable, Net Accounts payable related to costs incurred under fee building contracts Construction Payable Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information [Text Block] Quarterly Financial Information [Text Block] Equity Method Investments and Joint Ventures [Abstract] Cash and cash equivalents Equity Method Investment, Summarized Financial Information, Cash and Cash Equivalents Equity Method Investment, Summarized Financial Information, Cash and Cash Equivalents Restricted cash Equity Method Investment, Summarized Financial Information, Restricted Cash Equity Method Investment, Summarized Financial Information, Restricted Cash Real estate inventories Equity Method Investment, Summarized Financial Information, Real Estate Inventories Equity Method Investment, Summarized Financial Information, Real Estate Inventories Other assets Equity Method Investment, Summarized Financial Information, Other Assets Equity Method Investment, Summarized Financial Information, Other Assets Total assets Equity Method Investment, Summarized Financial Information, Assets Accounts payable and accrued liabilities Equity Method Investment, Summarized Financial Information, Accounts Payable and Accrued Liabilities Equity Method Investment, Summarized Financial Information, Accounts Payable and Accrued Liabilities Notes Payable Equity Method Investment, Summarized Financial Information, Notes Payable Equity Method Investment, Summarized Financial Information, Notes Payable Liabilities Equity Method Investment, Summarized Financial Information, Liabilities The Company's equity Equity Method Investment, Summarized Financial Information, Equity Excluding Noncontrolling Interests Other partners' equity Equity Method Investment, Summarized Financial Information, Noncontrolling Interest Total equity Equity Method Investment Summarized Financial Information, Equity Total liabilities and equity Equity Method Investment, Summarized Financial Information, Liabilities and Equity Ratio of indebtedness to capital of equity method investments Ratio of indebtedness to capital of equity method investments Ratio of indebtedness to capital of equity method investments Debt-to-equity ratio Ratio of indebtedness to equity Ratio of indebtedness to equity Fair Value Disclosures [Abstract] Fair Value Disclosures Fair Value Disclosures [Text Block] Income Tax Disclosure [Abstract] Statement [Table] Statement [Table] Tax Period [Axis] Tax Period [Axis] Tax Period [Domain] Tax Period [Domain] Latest Tax Year [Member] Latest Tax Year [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Statement [Line Items] Statement [Line Items] Tax Cuts And Jobs Act Of 2017, Deferred Tax Asset, Change In Tax Rate, Provisional Adjustment Tax Cuts And Jobs Act Of 2017, Deferred Tax Asset, Change In Tax Rate, Provisional Adjustment Tax Cuts And Jobs Act Of 2017, Deferred Tax Asset, Change In Tax Rate, Provisional Adjustment Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Pretax income (loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (Provision) benefit for income taxes at federal statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount State income taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Manufacturing deduction Effective Income Tax Rate Reconciliation, Deduction, Qualified Production Activity, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount Other Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Provision for income taxes Income Tax Expense (Benefit) Effective tax rate Effective Income Tax Rate Reconciliation, Percent Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] 401(k) Plan [Axis] 401(k) Plan [Axis] 401(k) Plan [Axis] 401(k) Plan [Domain] 401(k) Plan [Domain] [Domain] for 401(k) Plan [Axis] Sponsor [Member] Sponsor [Member] Sponsor [Member] Participant [Member] Participant [Member] Participant [Member] Remeasurement [Axis] Remeasurement [Axis] Remeasurement [Axis] Remeasurement [Domain] Remeasurement [Domain] [Domain] for Remeasurement [Axis] Gain on Fair Value Remeasurement [Member] Gain on Fair Value Remeasurement [Member] Gain on Fair Value Remeasurement [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Board Affiliate [Member] Board Affiliate [Member] Board Affiliate [Member] 10% Common Stock Affiliate [Member] 10% Common Stock Affiliate [Member] 10% Common Stock Affiliate [Member] Gain on Joint Venture Closeout [Member] [Member] Gain on Joint Venture Closeout [Member] [Member] Gain on Joint Venture Closeout [Member] [Member] Consultant Stelmar [Member] Consultant Stelmar [Member] Consultant Stelmar [Member] Consultant Davis [Member] Consultant Davis [Member] Consultant Davis [Member] TL Fab LP [Member] TL Fab LP [Member] TL Fab LP [Member] Director [Member] Director [Member] Board Member and 10% Beneficial Owner [Member] Board Member and 10% Beneficial Owner [Member] Board Member and 10% Beneficial Owner [Member] Related Party [Member] Related Party [Member] Related Party [Member] Corporate Joint Venture [Member] Corporate Joint Venture [Member] FMR LLC [Member] FMR LLC [Member] FMR LLC [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Construction-related Costs [Member] Construction-related Costs [Member] Construction-related Costs [Member] Management Fees [Member] Management Fees [Member] Management Fees [Member] Russell Ranch [Member] Russell Ranch [Member] Russell Ranch [Member] Trade Payment [Member] Trade Payment [Member] Trade Payment [Member] Profit Participation [Member] Profit Participation [Member] Profit Participation [Member] Builder Fees [Member] Builder Fees [Member] Builder Fees [Member] Monthly consulting fee [Member] Monthly consulting fee [Member] Monthly consulting fee [Member] Consulting Fee [Member] Consulting Fee [Member] Consulting Fee [Member] Monthly consulting fee - reduced [Member] Monthly consulting fee - reduced [Member] Monthly consulting fee - reduced [Member] Interest Income on Note to Joint Venture [Member] Interest Income on Note to Joint Venture [Member] Interest Income on Note to Joint Venture [Member] 394 Lot Development [Member] 394 Lot Development [Member] 394 Lot Development [Member] 418 Lot Development [Member] 418 Lot Development [Member] 418 Lot Development [Member] Northern CA Phased Takedown [Member] Northern CA Phased Takedown [Member] Northern CA Phased Takedown [Member] Northern CA Rolling Option [Member] Northern CA Rolling Option [Member] Northern CA Rolling Option [Member] Northern CA Finished Lots [Member] Northern CA Finished Lots [Member] Northern CA Finished Lots [Member] Arizona Master Plan [Member] Arizona Master Plan [Member] Arizona Master Plan [Member] Bedford 1 [Member] Bedford 1 [Member] Bedford 1 [Member] Bedford 2 [Member] Bedford 2 [Member] Bedford 2 [Member] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Wholly owned [Member] Wholly owned [Member] Wholly owned [Member] Unconsolidated Joint Ventures [Member] Unconsolidated Joint Ventures [Member] Unconsolidated Joint Ventures [Member] Related Party Transaction Deferred Revenue [Axis] Related Party Transaction Deferred Revenue [Axis] Related Party Transaction Deferred Revenue [Axis] Related Party Transaction Deferred Revenue [Domain] Related Party Transaction Deferred Revenue [Domain] [Domain] for Related Party Transaction Deferred Revenue [Axis] Joint Venture Contribution [Member] Joint Venture Contribution [Member] Joint Venture Contribution [Member] Joint Venture Asset Acquisition [Member] Joint Venture Asset Acquisition [Member] Joint Venture Asset Acquisition [Member] Reduction in Land Basis [Member] Reduction in Land Basis [Member] Reduction in Land Basis [Member] Cannery Land Sale [Member] Cannery Land Sale [Member] Cannery Land Sale [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Expenses from transactions with related party Related Party Transaction, Expenses from Transactions with Related Party Due from affiliates Due from Affiliates Revenue from related party Revenue from Related Parties The percentage of ownership of common stock entities with investments in Company’s unconsolidated joint ventures hold The percentage of ownership of common stock entities with investments in Company’s unconsolidated joint ventures hold The percentage of ownership of common stock entities with investments in Company’s unconsolidated joint ventures hold Transaction amount Related Party Transaction, Amounts of Transaction Equity Method Investments, Number Equity Method Investments, Number Equity Method Investments, Number Investment in and advances to unconsolidated joint ventures Equity Method Investments Accounts Payable, Related Parties Accounts Payable, Related Parties Equity in net income (loss) of unconsolidated joint ventures Income (Loss) from Equity Method Investments Advances to Affiliate Advances to Affiliate Deferred Revenue Related Party Transaction, Purchases from Related Party Related Party Transaction, Purchases from Related Party Equity Method Investment, Unrealized Intercompany Profit (Loss) Not Eliminated, Amount Equity Method Investment, Unrealized Intercompany Profit (Loss) Not Eliminated, Amount Deferred Profit Contra WIP Balance Deferred Profit Contra WIP Balance Balance of deferred profit remaining in inventory as a reduction of land basis (contra WIP). Profit Participation Profit Participation Profit Participation Due to affiliates Due to Related Parties Purchase Agreement, Reimbursement Of Fee Credits Purchase Agreement, Reimbursement Of Fee Credits Purchase Agreement, Reimbursement Of Fee Credits Equity method investment, acquisition of partner's interest Equity method investment, acquisition of partner's interest Equity method investment, acquisition of partner's interest Proceeds from (Repayments of) Notes Payable Proceeds from (Repayments of) Notes Payable General Partners' Contributed Capital General Partners' Contributed Capital Lots under Purchase Agreement Recorded Lots under Purchase Agreement Recorded Lots under Purchase Agreement Recorded Deposits Assets Deposits Assets Estimated Purchase Price Estimated Purchase Price Estimated Purchase Price Lots Under Purchase Options Recorded Lots Under Purchase Options Recorded The carrying amount as of the balance sheet date of lots not owned but under a contract in which the entity has the option to purchase the lots. Purchase Options, Land Purchase Options, Land Master Marking Fees Master Marking Fees Master Marking Fees Purchased Lots Previously Under Purchase Options Purchased Lots Previously Under Purchase Options The number of lots owned that were previously under option contract. Construction Revenue Construction Revenue General Contractor Revenue General Contractor Revenue Fee building Construction and Development Costs Land owner fees reimbursed Land owner fees reimbursed Land owner fees reimbursed Option Payment Option Payment Option Payment Deposits Assets - Outstanding Deposits Assets - Outstanding Amount of nonrefundable deposits outstanding Investment Income, Investment Expense Investment Income, Investment Expense Supplemental Condensed Consolidating Statement of Cash Flows [Abstract] Supplemental Condensed Consolidating Statement of Cash Flows [Abstract] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Parent Company [Member] Parent Company [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, Eliminations [Member] Consolidation, Eliminations [Member] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Guarantor Subsidiaries [Member] Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Non-Guarantor Subsidiaries [Member] Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Cash assumed from joint venture at consolidation Cash Acquired from Acquisition Contributions and advances to unconsolidated joint ventures Payments to Acquire Interest in Joint Venture Contributions to Subsidiaries from Corporate Contributions to Subsidiaries from Corporate Contributions to Subsidiaries from Corporate Distributions of Equity from Subsidiaries Distributions of Equity from Subsidiaries Distributions of Equity from Subsidiaries Distributions of capital and repayment of advances from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution, Return of Capital Interest collected on advances to unconsolidated joint ventures Interest Income, Other Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used in) Investing Activities Borrowings from credit facility Proceeds from Issuance of Unsecured Debt Repayments of credit facility Repayments of Unsecured Debt Proceeds from senior notes Proceeds from Issuance of Senior Long-term Debt Borrowings from other notes payable Proceeds from Notes Payable Repayments of other notes payable Payment of debt issuance costs Payments of Debt Issuance Costs Cash distributions to non-controlling interest in subsidiary Payments to Noncontrolling Interests Contributions to subsidiaries from corporate Proceeds from Contributions from Parent Distributions to Corporate from Subsidiaries Distributions to Corporate from Subsidiaries Distributions to Corporate from Subsidiaries Repurchase of common stock Payments for Repurchase of Common Stock Tax withholding paid on behalf of employees for stock awards Payments Related to Tax Withholding for Share-based Compensation Excess income tax benefit from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Proceeds from exercise of stock options Proceeds from Stock Options Exercised Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Cash, cash equivalents and restricted cash – end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net proceeds from issuance of common stock Proceeds from Issuance of Common Stock Earnings Per Share [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Subsidiary, Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock, Name of Transaction [Domain] Sale of Stock [Domain] IPO [Member] IPO [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock [Member] Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Schedule of contracts and accounts receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Other Assets [Abstract] Property, equipment and capitalized selling and marketing costs, net(1)(2) Property, Plant and Equipment, Net Deferred tax asset, net Deferred Tax Assets, Net Prepaid income taxes Prepaid Taxes Prepaid expenses Prepaid Expense Warranty insurance receivable(3) Insurance Settlements Receivable Capitalized selling and marketing costs(1) Deferred Costs Total other assets Other Assets Capitalized Sales and Marketing Amortized Capitalized Sales and Marketing Amortized Capitalized Sales and Marketing Amortized Property and Equipment Depreciation Other Depreciation and Amortization Estimated probable recoveries Loss Contingency, Receivable Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Supplemental Cash Flow Elements [Abstract] Cash Flow, Supplemental Disclosures [Text Block] Cash Flow, Supplemental Disclosures [Text Block] Income Taxes Income Tax Disclosure [Text Block] Real Estate [Abstract] Summary of real estate inventories Schedule of Inventory, Noncurrent [Table Text Block] Inventory Impairments Asset Impairment Charges [Text Block] Computation of (Loss) Earnings Per Share Earnings Per Share [Text Block] Segment Reporting [Abstract] Schedule of financial information related to reportable segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Adoption of ASC 606 [Axis] Adoption of ASC 606 [Axis] Adoption of ASC 606 [Axis] Adoption of ASC 606 [Domain] Adoption of ASC 606 [Domain] [Domain] for Adoption of ASC 606 [Axis] ASC 606 Adoption Other Assets Write Off [Member] ASC 606 Adoption Other Assets Write Off [Member] ASC 606 Adoption Other Assets Write Off [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Employee Stock Options and Restricted Stock Units [Member] Employee Stock Options and Restricted Stock Units [Member] Employee Stock Options and Restricted Stock Units [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2018-07 [Member] Accounting Standards Update 2018-07 [Member] Accounting Standards Update 2018-07 [Member] Accounting Standards Update 2014-09 [Member] Accounting Standards Update 2014-09 [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk [Member] Customer Concentration Risk [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Fee Building Segment [Member] Fee Building Segment [Member] Fee Building Segment [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable [Member] Accounts Receivable [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Typical Ownership Threshold [Member] Maximum [Member] Restricted Cash Restricted Cash Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption Deferred Costs Deferred tax asset Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Selling and Marketing Expense Selling and Marketing Expense Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Restricted cash Restricted Cash and Cash Equivalents Inventory impairments Impairment of Real Estate Non-controlling interest in subsidiary Stockholders' Equity Attributable to Noncontrolling Interest Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Equity Method Investment, Impairment Of Joint Ventures Equity Method Investment, Impairment Of Joint Ventures Equity Method Investment, Impairment Of Joint Ventures Equity Method Investments, Impairment of Unconsolidated Entity Investments Equity Method Investments, Impairment of Unconsolidated Entity Investments Equity Method Investments, Impairment of Unconsolidated Entity Investments Impairments related to investment in unconsolidated joint ventures Equity Method Investment, Other than Temporary Impairment Allowance for doubtful contracts and accounts receivable Allowance for Doubtful Accounts Receivable Depreciation and amortization Depreciation Other Depreciation and Amortization Noncash deferred tax asset charge Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount Employer contribution amount Defined Contribution Plan, Employer Discretionary Contribution Amount Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Value Stock Repurchased And Retired During Period, Less Commissions, Value Stock Repurchased And Retired During Period, Less Commissions, Value Other than Temporary Impairment Losses, Investments Other than Temporary Impairment Losses, Investments Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Stock Options Employee Stock Option [Member] Non-Employee Stock Option [Member] Non-Employee Stock Option [Member] An arrangement whereby an non-employee (such a a former employee who is retained for consulting) is entitled to receive in the future, subject to vesting and other restrictions, a number of shares in the entity at a specified price, as defined in the agreement. Although there are variations, normally, after vesting, when an option is exercised, the non-employee-holder pays the strike value in cash to the issuing employer-entity and receives equity shares. The equity shares can be sold into the market for cash at the current market price without restriction. Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected dividends Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted-average grant date fair value per share (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Inventory Disclosure [Abstract] Impairment of Real Estate Homes Impairment of Real Estate Homes The charge against earnings in the period to reduce the carrying amount of real property to fair value. Impairment of Real Estate Land Impairment of Real Estate Land The charge against earnings in the period to reduce the carrying amount of land to the fair value. Total Inventory Impairments Remaining Carrying Value of Inventory Impaired Remaining Carrying Value of Inventory Impaired Remaining Carrying Value of Inventory Impaired Number of Projects Impaired Number of Projects Impaired The total number of projects impaired. Number of Projects Reviewed for Impairment Number of Projects Reviewed for Impairment The total number of projects reviewed for impairment during the year. Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Segment Reporting Segment Reporting, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Real Estate Inventories and Cost of Sales Inventory, Real Estate, Policy [Policy Text Block] Capitalization of Interest Interest Capitalization, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Noncontrolling Interest Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Investments in and Advances to Unconsolidated Joint Ventures Equity Method Investments [Policy Text Block] Selling and Marketing Expense Selling, General and Administrative Expenses, Policy [Policy Text Block] Warranty Accrual Standard Product Warranty, Policy [Policy Text Block] Contracts and Accounts Receivable Receivables, Policy [Policy Text Block] Property, Equipment and Capitalized Selling and Marketing Costs Property, Plant and Equipment, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Share Repurchase and Retirement Stockholders' Equity, Policy [Policy Text Block] Dividends Dividends [Policy Text Block] Dividends [Policy Text Block] Employee Benefit Plan Pension and Other Postretirement Plans, Nonpension Benefits, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Results of Quarterly Operations [Abstract] Results of Quarterly Operations [Abstract] Quarterly Financial Information [Table Text Block] Quarterly Financial Information [Table Text Block] Capitalized Interest [Abstract] Capitalized Interest [Abstract] Interest incurred Interest Costs Incurred Interest expensed Interest Expense Interest capitalized to inventory Real Estate Inventory, Capitalized Interest Costs Incurred Interest Capitalized to Investments in Unconsolidated Joint Ventures Interest Capitalized to Investments in Unconsolidated Joint Ventures Interest Capitalized to Investments in Unconsolidated Joint Ventures Real Estate Inventory, Capitalized Interest Costs [Roll Forward] Real Estate Inventory, Capitalized Interest Costs [Roll Forward] Capitalized interest in beginning inventory Real Estate Inventory, Capitalized Interest Costs Interest capitalized as a cost of inventory Capitalized interest acquired from unconsolidated joint venture at consolidation Real Estate Inventory, Capitalized Interest Acquired at Consolidation The amount of interest previously capitalized acquired from an unconsolidated joint venture in the period. Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition Contribution to unconsolidated joint ventures real estate inventory, capitalized interest costs in contributed inventory The amount of interest previously capitalized in inventory contributed to an unconsolidated joint venture in the period Previously capitalized interest included in cost of home sales Real Estate Inventory, Capitalized Interest Costs, Cost of Sales Capitalized interest in ending inventory Real Estate Inventory, Capitalized Interest Costs in Unconsolidated Joint Venture [Roll Forward] Real Estate Inventory, Capitalized Interest Costs in Unconsolidated Joint Venture [Roll Forward] Real Estate Inventory, Capitalized Interest Costs in Unconsolidated Joint Venture [Roll Forward] Capitalized interest in beginning investment in unconsolidated joint ventures Capitalized Interest in Investments in Unconsolidated Joint Ventures Capitalized Interest in Ending Investments in Unconsolidated Joint Ventures Interest capitalized to investment in unconsolidated joint ventures Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon consolidation Capitalized Interest Transferred from Investment in Unconsolidated Joint Venture to Inventory Upon Consolidation Capitalized Interest Transferred from Investment in Unconsolidated Joint Venture to Inventory Upon Consolidation Capitalized interest transferred from investment in unconsolidated joint venture to inventory upon lot acquisition Previously capitalized interest included in equity in net income (loss) of unconsolidated joint ventures Previously Capitalized Interest Included in Equity in Net Income of Unconsolidated Joint Ventures Previously Capitalized Interest Included in Equity in Net Income of Unconsolidated Joint Ventures Capitalized interest in ending investment in unconsolidated joint ventures Total capitalized interest in ending inventory and investments in unconsolidated joint ventures Capitalized Interest in Ending Inventory and Investments in Unconsolidated Joint Ventures Capitalized Interest in Ending Inventory and Investments in Unconsolidated Joint Ventures Capitalized interest as a percentage of inventory Capitalized Interest as a Percentage of Inventory Capitalized Interest as a Percentage of Inventory Interest included in cost of home sales as a percentage of home sales revenue Interest included in cost of sales as a percentage of home sales revenue Interest included in cost of sales as a percentage of home sales revenue Capitalized interest as a percentage of investment in and advances to unconsolidated joint ventures Capitalized Interest As A Percentage Of Investments In And Advances to Unconsolidated Joint Ventures Capitalized Interest as a Percentage of Investments in and Advances to Unconsolidated Joint Ventures OTTI - Interest previously capitalized to investment in unconsolidated JV Schedule of other assets Schedule of Other Assets [Table Text Block] Warranty [Abstract] Warranty [Abstract] Homebuilding Segment [Member] Homebuilding Segment [Member] Homebuilding Segment [Member] Insurance Settlements Receivable Adjustment related to higher warranty expenditures Standard and Extended Product Warranty Accrual, Adjustment For Higher Expected Warranty Expenditures Standard and Extended Product Warranty Accrual, Adjustment For Higher Expected Warranty Expenditures Adjustment to warranty accrual Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Increase (Decrease) in Insurance Settlements Receivable Increase (Decrease) in Insurance Settlements Receivable Adjustment related to lower warranty expenditures Standard and Extended Product Warranty Accrual, Adjustment For Lower Expected Warranty Expenditures Standard and Extended Product Warranty Accrual, Adjustment For Lower Expected Warranty Expenditures Income Statement [Abstract] Management fee revenue, unconsolidated joint ventures Management Fees Revenue Segment Information Segment Reporting Disclosure [Text Block] Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income (loss) to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Deferred taxes Deferred Income Tax Expense (Benefit) Amortization of stock-based compensation Share-based Compensation Excess income tax provision from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Abandoned project costs Abandoned Project Costs Abandoned Project Costs Gain from notes payable principal reduction Gain (Loss) on Extinguishment of Debt Distributions of earnings from unconsolidated joint ventures Proceeds from Equity Method Investment, Distribution Equity in net income (loss) of unconsolidated joint ventures Deferred profit from unconsolidated joint ventures Increase (Decrease) in Deferred Revenue Depreciation and amortization Net changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Contracts and accounts receivable Increase (Decrease) in Receivables Due from affiliates Increase (Decrease) Due from Affiliates Real estate inventories Increase (Decrease) in Inventories Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Due to affiliates Increase (Decrease) in Due to Affiliates Net cash used in operating activities Investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Interest collected on advances to unconsolidated joint ventures Payments for (Proceeds from) Other Investing Activities Net cash provided by (used in) investing activities Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Repurchase of common stock Net cash provided by financing activities Cash, cash equivalents and restricted cash – beginning of period Cash, cash equivalents and restricted cash – end of period Related Party Transactions Related Party Transactions Disclosure [Text Block] Unsecured revolving credit facility Line of Credit Facility, Fair Value of Amount Outstanding Assets, Fair Value Adjustment Assets, Fair Value Adjustment Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Discount Debt Instrument, Unamortized Premium Debt Instrument, Unamortized Premium Debt Instrument, Unamortized Debt Issuance Costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Number of Projects Impaired Number of Homebuilding Projects Impaired Number of Homebuilding Projects Impaired Impairment of Real Estate Liabilities, Fair Value Adjustment Liabilities, Fair Value Adjustment Schedule of components used in the computation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Other Assets Other Assets Disclosure [Text Block] Accrued Expenses and Other Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure [Text Block] Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure [Text Block] Revenues: Revenues [Abstract] Home sales Home Building Revenue Fee building, including management fees from unconsolidated joint ventures of $3,385, $4,945 and $8,202, respectively Revenues Revenue, Net Cost of Sales: Cost of Real Estate Sales [Abstract] Home sales Home Building Costs Home sales impairments Land sale impairment Cost of Sales Cost of Sales The cost related to generating revenue. Gross Margin: Gross Profit [Abstract] Gross Profit Home Sales Gross Profit Home Sales Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the home sales revenue generation. Gross Profit Land Sales Gross Profit Land Sales Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to land sales revenue generation. Gross Profit Fee Building Gross Profit Fee Building Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to fee building revenue generation. Gross Margin Gross Profit Expenses: Costs and Expenses [Abstract] Selling and marketing expenses General and administrative expenses General and Administrative Expense Other income (expense), net Other Nonoperating Income (Expense) Pretax income (loss) (Provision) benefit for income taxes Net income (loss) Net loss attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to The New Home Company Inc. Net Income (Loss) Attributable to Parent Earnings (loss) per share attributable to The New Home Company Inc.: Earnings Per Share, Basic Earnings Per Share, Basic Earnings Per Share, Diluted Earnings Per Share, Diluted Weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Income Tax Disclosure [Table] Income Tax Contingency [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal and State [Member] Federal and State [Member] Federal and State [Member] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Income Tax Disclosure [Line Items] Income Tax Contingency [Line Items] Deferred Tax Assets, State Taxes Deferred Tax Assets, State Taxes Deferred Tax Assets, Reserves and Accruals Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred Tax Assets, Intangible Assets Deferred Tax Assets, Goodwill and Intangible Assets Deferred Tax Assets, Tax Deferred Expense, Share-based Compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Inventory Deferred Tax Assets, Inventory Deferred Tax Assets, Investments in JVs Deferred Tax Assets, Equity Method Investments Deferred Tax Liabilities, Depreciation Deferred Tax Liabilities, Property, Plant and Equipment Real Estate Inventories Real Estate Disclosure [Text Block] Long-term Debt, Maturities, Repayments of Principal in 2019 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Maturities, Repayments of Principal in 2020 Long-term Debt, Maturities, Repayments of Principal in Year Two Long-term Debt, Maturities, Repayments of Principal in 2021 Long-term Debt, Maturities, Repayments of Principal in Year Three Long-term Debt, Maturities, Repayments of Principal in 2022 Long-term Debt, Maturities, Repayments of Principal in Year Four Long-term Debt, Maturities, Repayments of Principal in 2023 Long-term Debt, Maturities, Repayments of Principal in Year Five Long Term Debt, Maturities, Repayments of Principal Long Term Debt, Maturities, Repayments of Principal Long Term Debt, Maturities, Repayments of Principal Entity [Abstract] Entity [Abstract] Entity Public Float Entity Public Float Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Supplemental Condensed Consolidating Statement of Operations [Abstract] Supplemental Condensed Consolidating Statement of Operations [Abstract] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Revenue, Net Cost of Sales Gross Profit Equity in net income (loss) of subsdiaries Income (Loss) from Subsidiaries, before Tax Net Income (Loss) Attributable to The New Home Company Inc. Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Organization and Summary of Significant Account Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Homebuilding Joint Ventures [Member] Homebuilding Joint Ventures [Member] Homebuilding Joint Ventures [Member] Land Development Joint Ventures [Member] Land Development Joint Ventures [Member] Land Development Joint Ventures [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Other notes payable Notes Receivable [Member] Minimum [Member] Minimum [Member] Maximum [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Number Of Joint Venture Projects Impaired During Period Number Of Joint Venture Projects Impaired During Period Number Of Joint Venture Projects Impaired During Period Ownership percentage Proceeds from (Repayments of) Notes Payable Interest Paid, Net Interest Paid, Net Income Taxes Paid Income Taxes Paid Noncash or Part Noncash Acquisition, Inventory Acquired Noncash or Part Noncash Acquisition, Inventory Acquired Noncash or Part Noncash Acquisition, Inventory Acquired from Affiliates Noncash or Part Noncash Acquisition, Inventory Acquired from Affiliates The amount of inventory that an Entity acquires from affiliates in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. Contribution of Property Contribution of Property Contribution of Real Estate from Noncontrolling Interest in Subsidiary Contribution of Real Estate from Noncontrolling Interest in Subsidiary Contribution of Real Estate from Noncontrolling Interest in Subsidiary, Increase in Noncontrolling Interest in Subsidiary Adjustments to Additional Paid in Capital, IPO Adjustments to Additional Paid in Capital, IPO Deductible transaction costs and additional contribution of deferred tax assets from IPO Fair Value of Assets Acquired Fair Value of Assets Acquired Liabilities Assumed Liabilities Assumed Summary of common stock option activity Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of performance share units Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] Summary of stock-based compensation expense Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of valuation assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Balance outstanding at December 31 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Restricted stock units granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Restricted stock units vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Restricted stock units forfeited (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Balance outstanding at December 31 (shares) Weighted-Average Grant-Date Fair Value per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Balance outstanding at December 31 (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Restricted stock units granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Restricted stock units vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Restricted stock units forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Balance outstanding at December 31 (in dollars per share) Other Commitments [Table] Other Commitments [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Aliso Viejo, California [Member] Aliso Viejo, California [Member] Location of leased facility Other Locations [Member] Other Locations [Member] Other Locations [Member] Sublease [Member] Sublease [Member] Sublease [Member] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Other Commitments [Line Items] Other Commitments [Line Items] Lease agreements, area Area of Real Estate Property Operating Leases, Future Minimum Payments Due, 2019 Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating Leases, Future Minimum Payments, Due 2020 Operating Leases, Future Minimum Payments, Due in Two Years Operating Leases, Future Minimum Payments, Due 2021 Operating Leases, Future Minimum Payments, Due in Three Years Operating Leases, Future Minimum Payments, Due 2022 Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due 2023 Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Operating Leases, Future Minimum Payments Due Operating Leases, Future Minimum Payments Due Unconsolidated Joint Ventures Equity Method Investments and Joint Ventures Disclosure [Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Restricted Payment Limitations [Axis] Restricted Payment Limitations [Axis] Restricted Payment Limitations [Axis] Restricted Payment Limitations [Domain] Restricted Payment Limitations [Domain] [Domain] for Restricted Payment Limitations [Axis] Basket limitation components [Member] Basket limitation components [Member] Basket limitation components [Member] Exceptions for Additional Indebtedness Limitations [Axis] Exceptions for Additional Indebtedness Limitations [Axis] Exceptions for Additional Indebtedness Limitations [Axis] Exceptions for Additional Indebtedness Limitations [Domain] Exceptions for Additional Indebtedness Limitations [Domain] [Domain] for Exceptions for Additional Indebtedness Limitations [Axis] Existing or future credit facility borrowings [Member] Existing or future credit facility borrowings [Member] Existing or future credit facility borrowings [Member] Senior Note [Axis] Senior Note [Axis] Senior Note [Axis] Senior Note [Domain] Senior Note [Domain] [Domain] for Senior Note [Axis] Sr Notes Due 2022 [Member] Sr Notes Due 2022 [Member] Sr Notes Due 2022 [Member] Sr Notes Due 2022 Tack-on [Member] Sr Notes Due 2022 Tack-on [Member] Sr Notes Due 2022 Tack-on [Member] Accordion Feature Credit Facility [Axis] Accordion Feature Credit Facility [Axis] Accordion Feature Credit Facility [Axis] Accordion Feature Credit Facility [Domain] Accordion Feature Credit Facility [Domain] [Domain] for Accordion Feature Credit Facility [Axis] Accordion Feature Maximum Borrowing Capacity [Member] Accordion Feature Maximum Borrowing Capacity [Member] Accordion Feature Maximum Borrowing Capacity [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Letter of Credit [Member] Letter of Credit [Member] Construction loans Construction Loans [Member] Unsecured revolving credit facility Unsecured Debt [Member] Other notes payable Notes Payable, Other Payables [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] 2014 Note Payable to Land Seller [Member] 2014 Note Payable to Land Seller [Member] 2014 Note Payable to Land Seller [Member] 2012 Notes Payable to Land Seller [Member] 2012 Notes Payable to Land Seller [Member] 2012 Notes Payable to Land Seller [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR [Member] London Interbank Offered Rate (LIBOR) [Member] Prime Rate [Member] Prime Rate [Member] Other Notes Payable [Axis] Other Notes Payable [Axis] Other Notes Payable [Axis] Other Notes Payable [Domain] Other Notes Payable [Domain] [Domain] for Other Notes Payable [Axis] Notes Payable with Land Sellers [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Face value of note Debt Instrument, Face Amount Interest rate Percent of Debt Instrument Par Value Issued Percent of Debt Instrument Par Value Issued Percent of Debt Instrument Par Value Issued Interest rate at period end Line of Credit Facility, Interest Rate at Period End Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Percent of consolidated net income Percent of consolidated net income Percent of consolidated net income Net Cash Proceeds from Qualified Equity Offerings Net Cash Proceeds from Qualified Equity Offerings Net Cash Proceeds from Qualified Equity Offerings Consolidated tangible net assets Consolidated tangible net assets Consolidated tangible net assets Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Basket Limitation General Basket General Basket Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Line of Credit Facility, Increase (Decrease), Net Line of Credit Facility, Increase (Decrease), Net Long-term Debt Long-term Debt Gain (Loss) on Extinguishment of Debt Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Interest rate at period end Debt Instrument, Interest Rate, Effective Percentage Total commitment Debt Instrument, Maximum Borrowing Capacity Debt Instrument, Maximum Borrowing Capacity Amount available to borrow under construction loans Debt Instrument, Unused Borrowing Capacity, Amount Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Real estate purchase price Real Estate Acquired, Purchase Price Real Estate Acquired, Purchase Price Periodic payment Debt Instrument, Periodic Payment Number of loans Debt Instrument, Number of Loans Debt Instrument, Number of Loans Supplemental Guarantor Info [Abstract] Supplemental Guarantor Info [Abstract] Schedule of cash, cash equivalents and restricted cash Schedule of Cash and Cash Equivalents [Table Text Block] Performance Shares [Member] Performance Shares [Member] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Loss Contingencies [Table] Loss Contingencies [Table] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Financial Guarantee [Member] Financial Guarantee [Member] Underlying Asset Class [Axis] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Underlying Asset Class [Domain] Loans Payable [Member] Loans Payable [Member] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Surety Bond [Member] Surety Bond [Member] Corporate Joint Venture [Member] Optional Letter of Credit Facility Increase [Axis] Optional Letter of Credit Facility Increase [Axis] Optional Letter of Credit Facility Increase [Axis] Optional Letter of Credit Facility Increase [Domain] Optional Letter of Credit Facility Increase [Domain] [Domain] for Optional Letter of Credit Facility Increase [Axis] Optional Facility Increase [Member] Optional Facility Increase [Member] Optional Facility Increase [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Long-term Debt, Gross Long-term Debt, Gross Related Party Transaction, Guarantor Obligations, Underlying Asset Class Guaranteed Related Party Transaction, Guarantor Obligations, Underlying Asset Class Guaranteed Related Party Transaction, Guarantor Obligations, Underlying Asset Class Guaranteed Outstanding surety bonds Loss Contingency, Range of Possible Loss, Portion Not Accrued Loss Contingency Portion Attributable to Work Remaining to Complete Loss Contingency Portion Attributable to Work Remaining to Complete Loss Contingency Portion Attributable to Work Remaining to Complete Operating Leases, Rent Expense, Net Operating Leases, Rent Expense, Net Concentration Risk [Table] Concentration Risk [Table] Sales Revenue [Member] Sales Revenue, Net [Member] Contracts and Accounts Receivable [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk, number of customers Concentration Risk, Number Concentration Risk, Number Concentration Risk, Percentage Concentration Risk, Percentage Deferred tax asset Number of Homebuilding Projects Impaired Product Warranty Accrual [Table] Product Warranty Accrual [Table] Product Warranty Accrual [Table] Product Warranty Accrual [Line Items] Product Warranty Accrual [Line Items] [Line Items] for Product Warranty Accrual [Table] Movement in Standard Product Warranty Accrual [Roll Forward] Movement in Standard Product Warranty Accrual [Roll Forward] Beginning warranty liability Warranty provision Standard and Extended Product Warranty Accrual, Increase for Warranties Issued Warranty assumed from joint ventures at consolidation Warranty provision assumed from joint venture at consolidation Warranty provision assumed from joint venture at consolidation Warranty payments Standard and Extended Product Warranty Accrual, Decrease for Payments Ending warranty liability Schedule of accrued liabilities and other liabilities Schedule of Accrued Liabilities and Other Liabilities [Table Text Block] Schedule of Accrued Liabilities and Other Liabilities [Table Text Block] Schedule of changes in warranty accrual Schedule of Product Warranty Liability [Table Text Block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Net income (loss) attributable to The New Home Company Inc. Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Basic weighted-average shares outstanding Stock options and unvested restricted stock units Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Diluted weighted-average shares outstanding Basic earnings (loss) per share attributable to The New Home Company Inc. Diluted earnings (loss) per share attributable to The New Home Company Inc. Antidilutive stock options and unvested restricted stock units not included in diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted Stock Units Restricted Stock Unit and Performance Share Unit Awards [Member] Restricted Stock Unit and Performance Share Unit Awards [Member] Stock-based compensation expense Allocated Share-based Compensation Expense Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Revenues Equity Method Investment, Summarized Financial Information, Revenue Cost of sales and expenses Equity Method Investment Summarized Financial Information Cost of Sales and Expenses The amount of cost of sales and expenses reported by an equity method investment of an entity. Net income (loss) of unconsolidated joint ventures Equity Method Investment, Summarized Financial Information, Net Income (Loss) Land sales Equity Method Investment, Summarized Financial Information, Cost of Sales, Land Sales Equity Method Investment, Summarized Financial Information, Cost of Sales, Land Sales Inventory impairments Equity Method Investment, Summarized Financial Information, Cost of Sales, Inventory Impairments Equity Method Investment, Summarized Financial Information, Cost of Sales, Inventory Impairments Gross Margin Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) Expenses Equity Method Investment, Summarized Financial Information, Expenses Equity Method Investment, Summarized Financial Information, Expenses Net loss Equity Method Investment, Summarized Financial Information, Income (Loss) from Continuing Operations Equity in net income of unconsolidated joint ventures reflected in the accompanying consolidated statements of operations Statement of Financial Position [Abstract] Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares outstanding Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares outstanding Preferred Stock, Shares Issued Common stock, par value per share (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Statement of Stockholders' Equity [Abstract] Stockholders' Equity [Member] Stockholders' Equity Attributable to Parent [Member] Stockholders' Equity Attributable to Parent [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Noncontrolling Interest [Member] Noncontrolling Interest [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Beginning balance, shares Shares, Outstanding Adoption of ASC 606 and ASU 2018-07 Net income (loss) Noncontrolling interest distribution Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Stock-based compensation expense Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans, shares Shares Paid for Tax Withholding for Share Based Compensation Shares net settled with the Company to satisfy employee personal income tax liabilities resulting from share based compensation plans Adjustments to Additional Paid in Capital, Other Excess tax provision from stock-based compensation Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Shares issued through stock plans Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Shares issued through stock plans, shares Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Repurchase of common stock Stock Repurchased and Retired During Period, Value Repurchase of common stock, shares Ending balance Ending balance, shares Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Deposits and pre-acquisition costs Inventory, Real Estate, Deposits and Pre-Acquisition Costs Inventory, Real Estate, Deposits and Pre-Acquisition Costs Land held and land under development Inventory, Real Estate, Land and Land Development Costs Homes completed or under construction Inventory, Real Estate, Homes Completed or Construction in Progress Inventory, Real Estate, Homes Finished or Construction in Progress Model homes Inventory, Real Estate, Model Homes Inventory, Real Estate, Model Homes Real estate inventories Inventory, Real Estate Deposits and pre-acquisition costs, refundable Inventory, Real Estate, Deposits and Pre-Acquisition Costs, Refundable Inventory, Real Estate, Deposits and Pre-Acquisition Costs, Refundable Supplemental Guarantor Information [Abstract] Supplemental Guarantor Information [Abstract] Supplemental Guarantor Info [Text Block] Supplemental Guarantor Info [Text Block] Supplemental Guarantor Info [Text Block] Assets Assets [Abstract] Restricted cash Contracts and accounts receivable Real estate inventories Other assets Total assets Assets Liabilities and equity Liabilities and Equity [Abstract] Accounts payable Accounts Payable Accrued expenses and other liabilities Senior notes, net Senior Notes Total liabilities Liabilities Commitments and Contingencies Commitments and Contingencies Equity: Equity [Abstract] Stockholders' equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares outstanding Preferred Stock, Value, Issued Common stock, $0.01 par value, 500,000,000 shares authorized, 20,058,904 and 20,876,837, shares issued and outstanding as of December 31, 2018 and December 31, 2017, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Total stockholders' equity Stockholders' Equity Attributable to Parent Total equity Total liabilities and equity Liabilities and Equity Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of reportable segments Number of Reportable Segments Home sales revenue Fee building revenue (Loss) income before taxes Assets Revenue Category [Axis] Revenue Category [Axis] Revenue Category [Axis] Revenue Category [Domain] Revenue Category [Domain] [Domain] for Revenue Category [Axis] Land sales [Member] Land sales [Member] Land sales [Member] Inventory [Axis] Inventory [Axis] Inventory [Domain] Inventory [Domain] Home Sales [Member] Home Sales [Member] Home Sales [Member] Cost of homes sales Homebuilding gross margin Land sales gross margin Fee building gross margin Fair Value of Financial Instruments [Abstract] Fair Value of Financial Instruments [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2014 Incentive Plan [Member] 2014 Incentive Plan [Member] 2014 Incentive Plan [Member] 2016 Incentive Plan [Member] [Member] 2016 Incentive Plan [Member] [Member] 2016 Incentive Plan [Member] [Member] 2016 Incentive Plan Amended and Restated [Member] 2016 Incentive Plan Amended and Restated [Member] 2016 Incentive Plan Amended and Restated [Member] Equity Based Incentive Units Equity Based Incentive Units [Member] Equity Based Incentive Units [Member] Stock Options and Restricted Stock Units Award value on date of grant Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Grant Date Fair Value Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Number of shares that may be issued under plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Award expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Unearned stock-based compensation expense not yet recognized Unearned stock-based compensation expense not yet recognized, recognition period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Supplemental Condensed Consolidating Balance Sheet [Table Text Block] Supplemental Condensed Consolidating Balance Sheet [Table Text Block] [Table Text Block] for Supplemental Condensed Consolidating Balance Sheet [Table] Supplemental Condensed Consolidating Statement of Operations [Table Text Block] Supplemental Condensed Consolidating Statement of Operations [Table Text Block] [Table Text Block] for Supplemental Condensed Consolidating Statement of Operations [Table] Supplemental Condensed Consolidated Statement of Cash Flows [Table Text Block] Supplemental Condensed Consolidated Statement of Cash Flows [Table Text Block] Supplemental Condensed Consolidated Statement of Cash Flows [Table Text Block] Capitalized Interest Homebuilding Interest [Text Block] The entire disclosure for homebuilding interest and homebuilding interest capitalization. Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Joint Venture Impairment [Table Text Block] Joint Venture Impairment [Table Text Block] Joint Venture Impairment [Table Text Block] Schedule of summarized financial information of unconsolidated joint ventures Equity Method Investments [Table Text Block] Unsecured revolving credit facility Notes payable Summary of interest incurred, capitalized, and expensed Interest Income and Interest Expense Disclosure [Table Text Block] Notes Payable, Fair Value Disclosure Notes Payable, Fair Value Disclosure Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] Current Federal Tax Expense (Benefit) Current Federal Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Current State and Local Tax Expense (Benefit) Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Deferred Federal Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) Deferred State and Local Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit) Provision for income taxes Schedule of notes payable Schedule of Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-term Debt [Table Text Block] Contracts and Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Over-Allotment Option [Member] Over-Allotment Option [Member] Follow-on offering [Member] Follow-on offering [Member] Follow-on offering Conversion of members' equity into common stock, shares Stock Issued During Period, Shares, Conversion of Members' Equity Stock Issued During Period, Shares, Conversion of Members' Equity Issuance of common stock, net of issuance costs, shares Stock Issued During Period, Shares, New Issues Share Price (in dollars per share) Share Price Repurchase of common stock, shares Stock Repurchased During Period, Shares Net proceeds from issuance of common stock, net of underwriting discount, offering expenses and repurchase or shares Proceeds from Issuance of Common Stock, Net of Common Stock Repurchase Payments Proceeds from Issuance of Common Stock, Net of Common Stock Repurchase Payments Supplemental Condensed Consolidating Balance Sheet [Abstract] Supplemental Condensed Consolidating Balance Sheet [Abstract] Intercompany Receivables Intercompany Receivables Intercompany Receivables Investment in and advances to unconsolidated joint ventures Investment in subsidiaries Investments in Affiliates, Subsidiaries, Associates, and Joint Ventures, Fair Value Disclosure Intercompany Payables Intercompany Payables Intercompany Payables Due to Affiliate Due to Affiliate Stockholders' Equity Attributable to Parent Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]