Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Terminus Office Holdings Terminus Office Holdings [Member] Terminus Office Holdings [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] JPM Institutional investors advised by J.P. Morgan Asset Management [Member] Institutional investors advised by J.P. Morgan Asset Management [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Office Buildings Office Building [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Secured Mortgage Note Payable Secured Mortgage Note Payable [Member] Secured Mortgage Note Payable. Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Ownership percentage of partner in joint venture Ownership Percentage of Partner in Joint Venture Ownership percentage of partner in Joint Venture. Number of properties owned Number of Real Estate Properties Owned by Equity Investee number of real estate properties owned by equity investee as of the balance sheet date. Number of non-recourse mortgage loans Debt Instrument, Number of Instruments Debt Instrument, Number of Instruments Principal amount Debt Instrument, Face Amount Weighted average interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Cash balance of joint venture Equity Method Investments Summarized Financial Information Cash Equity method investments summarized financial information cash. Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [Member] Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] At Spin-off At Spin-off [Member] At Spin-off [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding at end of period (in shares) Weighted-Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding at beginning of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in usd 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 Vested (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Forfeited (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding at end of period (in usd per share) Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Segment Reconciling Items Segment Reconciling Items [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Office Office Segment [Member] Office segment. Mixed-Use Mixed-Use [Member] Mixed-Use [Member] Other Other Segments [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Atlanta Atlanta, GA [Member] Atlanta, GA [Member] Houston Houston, TX [Member] Houston, TX [Member] Austin Austin TX [Member] Austin TX [Member] Charlotte Charlotte, NC [Member] Charlotte, NC [Member] Orlando Orlando, Florida [Member] Orlando, Florida [Member] Tampa Tampa, Florida [Member] Tampa, Florida [Member] Phoenix Phoenix, Arizona [Member] Phoenix, Arizona [Member] Other Other Location [Member] Other Location [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Company's share of rental property revenues from unconsolidated joint ventures Rental properties revenues from unconsolidated joint ventures Rental properties revenues from unconsolidated joint ventures Revenues included in discontinued operations Disposal Group, Including Discontinued Operation, Revenue Total rental property revenues Real Estate Revenue, Net Statement of Stockholders' Equity [Abstract] Common dividends per share (in usd per share) Common Stock, Dividends, Per Share, Cash Paid HICO Avalon II, LLC HICO Avalon II, LLC [Member] HICO Avalon II, LLC [Member] Hines II Hines Avalon Investor, LLC [Member] Hines Avalon Investor, LLC [Member] Predevelopment costs, funding percentage Predevelopment Costs, Funding Percentage Predevelopment Costs, Funding Percentage Development costs, funding percentage Development Costs, Funding Percentage Development Costs, Funding Percentage SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract] Real Estate and Accumulated Depreciation, by Property [Table] SEC Schedule III, Real Estate and Accumulated Depreciation, by Property [Table] Real Estate, Type of Property [Axis] Real Estate, Type of Property [Axis] Real Estate [Domain] Real Estate [Domain] OPERATING PROPERTIES Operating Properties [Member] Operating properties. PROJECTS UNDER DEVELOPMENT Projects under Development [Member] Projects under Development [Member] LAND Land [Member] Commercial Land Commercial Land [Member] Commercial Land [Member] Austin, TX Atlanta, GA Atlanta, Georgia [Member] Atlanta, Georgia [Member] Charlotte, NC Charlotte, North Carolina [Member] Charlotte, North Carolina [Member] Tampa, FL Phoenix, AZ Suburban Atlanta, GA Suburban Atlanta, Georgia [Member] Suburban Atlanta, Georgia [Member] Name of Property [Axis] Name of Property [Axis] Name of Property [Domain] Name of Property [Domain] Colorado Tower Colorado Tower [Member] Colorado Tower [Member] 816 Congress 816 Congress Austin, TX [Member] 816 Congress Austin, TX[Member] Research Park Research Park Austin [Member] Research park v Austin. Northpark Town Center Northpark Town Center [Member] Northpark Town Center [Member] Promenade Promenade D Atlanta GA [Member] Promenade (d) Atlanta, GA. Meridian Mark Plaza Meridian Mark Plaza Atlanta [Member] Meridian mark plaza Atlanta. Fifth Third Center Fifth Third Center [Member] Fifth Third Center [Member] Corporate Center Corporate Center [Member] Corporate Center [Member] The Pointe The Pointe [Member] The Pointe [Member] Harborview Plaza Harborview Plaza [Member] Harborview Plaza [Member] 3344 Peachtree 3344 Peachtree [Member] 3344 Peachtree [Member] One Buckhead Plaza One Buckhead Plaza [Member] One Buckhead Plaza [Member] 3350 Peachtree 3350 Peachtree [Member] 3350 Peachtree [Member] 3348 Peachtree 3348 Peachtree [Member] 3348 Peachtree [Member] 8000 Avalon Avalon [Member] Avalon [Member] Two Buckhead Plaza Two Buckhead Plaza [Member] Two Buckhead Plaza [Member] Hearst Tower Hearst Tower [Member] Hearst Tower [Member] NASCAR Plaza NASCAR Plaza [Member] NASCAR Plaza [Member] Hayden Ferry Hayden Ferry [Member] Hayden Ferry [Member] 111 West Rio 111 West Rio [Member] 111 West Rio [Member] Tempe Gateway Tempe Gateway [Member] Tempe Gateway [Member] One Eleven Congress One Eleven Congress [Member] One Eleven Congress [Member] San Jacinto Center San Jacinto Center [Member] San Jacinto Center [Member] NCR Phase 1 NCR Phase I [Member] NCR Phase I [Member] NCR Phase II NCR Phase II [Member] NCR Phase II [Member] 300 Colorado Three Hundred Colorado [Member] Three Hundred Colorado [Member] Land Adjacent to The Avenue Forsyth Land Adjacent to The Avenue Forsyth Suburban Atlanta [Member] Land adjacent to the avenue Forsyth suburban Atlanta. North Point North Point Suburban Atlanta [Member] North point suburban Atlanta. Real Estate and Accumulated Depreciation [Line Items] SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] Encumbrances SEC Schedule III, Real Estate and Accumulated Depreciation, Amount of Encumbrances Initial Cost to Company SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost [Abstract] Land and Improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Land Buildings and Improvements SEC Schedule III, Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements Costs Capitalized Subsequent to Acquisition SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition [Abstract] Land and Improvements less Cost of Sales, Transfers and Other SEC Schedule III, Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Land Building and Improvements less Cost of Sales, Transfers and Other SEC Schedule III Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Buildings and Improvements Gross Amount at Which Carried at Close of Period SEC Schedule III, Real Estate, Gross [Abstract] Land and Improvements less Cost of Sales, Transfers and Other SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Land Building and Improvements less Cost of Sales, Transfers and Other SEC Schedule III, Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements Total SEC Schedule III, Real Estate, Gross Accumulated Depreciation SEC Schedule III, Real Estate Accumulated Depreciation Life on Which Depreciation in 2016 Statement of Operations is Computed SEC Schedule III, Real Estate and Accumulated Depreciation, Life Used for Depreciation Business Combinations [Abstract] Summary of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Unaudited supplemental pro forma information Business Acquisition, Pro Forma Information [Table Text Block] Summary of discontinued operations Disposal Groups, Including Discontinued Operations [Table Text Block] Austin 300 Colorado Project, LP Austin 300 Colorado Project, LP [Member] Austin 300 Colorado Project, LP [Member] 3CB 3C Block 28 Partners, LP [Member] 3C Block 28 Partners, LP [Member] 3CRR 3C RR Xylem, LP [Member] 3C RR Xylem, LP [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Square footage of real estate property (square feet) Area of Real Estate Property Ownership interest percentage Equity Method Investment, Ownership Percentage Cash contributions to joint venture Payments to Acquire Interest in Joint Venture Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Credit Facility Line of Credit [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Federal Funds Rate Federal Funds Rate [Member] Federal Funds Rate [Member] One-month LIBOR One-month LIBOR [Member] One-month LIBOR [Member] Base Rate Base Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Unencumbered interest coverage ratio Debt Instrument, Covenant Compliance, Unencumbered Interest Coverage Ratio Debt Instrument, Covenant Compliance, Unencumbered Interest Coverage Ratio Fixed charge coverage ratio Debt Instrument, Covenant Compliance, Fixed Charge Coverage Ratio Debt Instrument, Covenant Compliance, Fixed Charge Coverage Ratio Leverage ratio (percent) Line Of Credit, Leverage Ratio Line Of Credit, Leverage Ratio Minimum shareholders' equity Shareholders' Equity, Minimum Shareholders' Equity, Minimum Basis spread on variable rate (percent) Debt Instrument, Basis Spread on Variable Rate Annual Facility Fee % Line of Credit Facility, Commitment Fee Percentage Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity American Airlines American Airlines [Member] American Airlines [Member] Purchase of interest in the building Real Estate Investment Property, Purchase Price Real Estate Investment Property, Purchase Price Income from unconsolidated joint ventures Income (Loss) from Equity Method Investments 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Total Notes Payable Long-term Debt, Gross Performance-based RSUs Performance based Restricted Stock Unit [Member] Performance-based Restricted Stock Unit. Summary of all performance-based RSU activity Reconciliation of NOI to net income available to common stockholders Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Reconciliation of revenue from segments to consolidated Reconciliation of Revenue from Segments to Consolidated [Table Text Block] TRANSACTIONS WITH PARKWAY PROPERTIES, INC. Mergers, Acquisitions and Dispositions Disclosures [Text Block] Accounting Policies [Abstract] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Basis of Presentation Basis of Presentation [Policy Text Block] Basis of Presentation. Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Cost Capitalization, Depreciation and Amortization Property, Plant and Equipment, Policy [Policy Text Block] Impairment Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Acquisition of Real Estate Assets Business Combinations Policy [Policy Text Block] Discontinued Operations Discontinued Operations, Policy [Policy Text Block] Investment in Joint Ventures Equity Method Investments [Policy Text Block] Noncontrolling Interest Consolidation, Subsidiaries or Other Investments, Consolidated Entities, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Receivables Receivables, 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] Earnings per Share (EPS) Earnings Per Share, 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] Use of Estimates Use of Estimates, Policy [Policy Text Block] Reportable Segments Segment Reporting, Policy [Policy Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill [Roll Forward] Goodwill [Roll Forward] Beginning Balance Goodwill Allocated to property sales and Spin-Off Goodwill, Written off Related to Sale of Business Unit Ending Balance Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Distribution Type [Axis] Distribution Type [Axis] Distribution Type [Domain] Distribution Type [Domain] Ordinary Dividends Ordinary Dividends [Member] Ordinary Dividends. Long-Term Capital Gain Long Term Capital Gain [Member] Long term capital gain. Class of Stock [Line Items] Class of Stock [Line Items] Tax Status of Common Stock Dividends Per Share Declared (in usd per share) Tax status of common stock dividends per share declared Tax status of common stock dividends per share declared Unrecaptured Section 1250 Gain (in usd per share) Unrecaptured Section One Thousand Two Hundred Fifty Gain Unrecaptured section 1250 gain. Nondividend Distributions (in usd per share) Nondividend Distribution Per Share Nondividend Distribution Per Share AMT Adjustment (in usd per share) Alternative Minimum Tax Adjustment Per Share Alternative Minimum Tax Adjustment Per Share Equity Method Investee, Name [Axis] Charlotte Gateway Village, LLC Charlotte Gateway Village LLC [Member] Charlotte Gateway Village, LLC. BOA Bank of America Corporation [Member] Bank of America Corporation [Member] Compounded rate of return received by Company (percent) Equity Method Investment, Additional Information, Compounded Rate of Return Received By Company Equity Method Investment, Additional Information, Compounded Rate of Return Received By Company Percentage of Company's income (loss) received in final step of distribution Equity Method Investment, Additional Information, Maximum Percentage of Company's Income Loss Distributed to Third Party Equity Method Investment, Additional Information, Maximum Percentage of Company's Income (Loss) Distributed to Third Party Allocation of net income and cash flows, percentage Equity Method Investment, Allocation of Net Income (Loss) and Cash Flows, Percentage Equity Method Investment, Allocation of Net Income (Loss) and Cash Flows, Percentage Maximum internal rate of return to be achieved Equity Method Investment, Maximum Internal Rate of Return Equity Method Investment, Maximum Internal Rate of Return Allocation of proceeds from capital transactions, percentage, third priority Equity Method Investment, Allocation of Proceeds from Capital Transactions, Percentage, Priority Three Equity Method Investment, Allocation of Proceeds from Capital Transactions, Percentage, Priority Three Maximum IRR on project (percent) Maximum IRR on Project maximum IRR on project. Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Parkway merger Parkway [Member] Parkway [Member] Buildings and Improvements Building and Building Improvements [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Real Estate SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward] Balance at beginning of period Additions during the period: Additions of Real Estate During Period [Abstract] Additions of real estate during period. Acquisitions SEC Schedule III, Real Estate, Acquisitions Through Foreclosures Improvements and other capitalized costs SEC Schedule III, Real Estate, Improvements Transfers SEC Schedule III, Real Estate, Transfers SEC Schedule III, Real Estate, Transfers Real estate additions, total Real Estate Additions Gross Real estate additions gross. Deductions during the period: Deductions of Real Estate [Abstract] Deductions of real estate. Parkway spin-off SEC Schedule III, Real Estate, Other Deductions Cost of real estate sold SEC Schedule III, Real Estate, Cost of Real Estate Sold Impairment loss SEC Schedule III, Real Estate, Write-down or Reserve, Amount Real estate deductions, total Real Estate Deductions Gross Real estate deductions gross. Balance at end of period Accumulated Depreciation SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward] Balance at beginning of period Additions during the period: Additions of Real Estate Accumulated Depreciation During Period [Abstract] Additions of real estate accumulated depreciation during period. Acquisitions Real Estate Accumulated Depreciation Acquisition Cost Real estate accumulated depreciation acquisition cost. Improvements and other capitalized costs SEC Schedule III, Real Estate Accumulated Depreciation, Other Additions Transfers SEC Schedule III, Real Estate Accumulated Depreciation, Transfers SEC Schedule III, Real Estate Accumulated Depreciation, Transfers Depreciation expense SEC Schedule III, Real Estate Accumulated Depreciation, Depreciation Expense Real estate accumulated depreciation additions, total Real Estate Accumulated Depreciation Additions Gross Real estate accumulated depreciation additions total. Deductions during the period: Deductions of Real Estate Accumulated Depreciation During Period [Abstract] Deductions of real estate accumulated depreciation during period. Parkway spin-off SEC Schedule III, Real Estate Accumulated Depreciation, Other Deductions Cost of real estate sold SEC Schedule III, Real Estate Accumulated Depreciation, Real Estate Sold Impairment loss Real Estate Accumulated Depreciation Write Off of Fully Depreciated Assets Real estate accumulated depreciation write off of fully depreciated assets. Real estate accumulated depreciation deductions, total Real Estate Accumulated Depreciation Deductions Gross Real estate accumulated depreciation deductions total. Balance at end of period Aggregate cost for federal income tax, net of depreciation SEC Schedule III, Real Estate, Net SEC Schedule III, Real Estate, Net Useful life Summary of terms of notes payable Schedule of Debt [Table Text Block] Schedule of pricing spreads and facility fee Schedule Of Basis Spread And Facility Fee On Line Of Credit Facilities [Table Text Block] Schedule Of Basis Spread And Facility Fee On Line Of Credit Facilities [Table Text Block] Summary of interest recorded Interest Costs Incurred Net of Amounts Capitalized [Table Text Block] Interest costs incurred, net of amounts capitalized. Schedule of future principal payments due Schedule of Maturities of Long-term Debt [Table Text Block] Crawford Long - CPI, LLC Crawford Long CPI LLC [Member] Crawford Long - CPI, LLC. Emory University Emory University [Member] Emory University. Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Aggregate outstanding indebtedness Equity Method Investment Summarized Financial Information Debt Equity method investment summarized financial information debt. Outstanding balance of mortgage loan Mortgage Loans on Real Estate, Carrying Amount of Mortgages Interest rate on mortgage loan (percent) Debt Instrument, Interest Rate, Stated Percentage AMCO 120 WT Holdings, LLC AMCO 120 WT Holdings, LLC [Member] AMCO 120 WT Holdings, LLC [Member] AMLI Residential AMLI Residential [Member] AMLI Residential [Member] Office Space Office Space [Member] Office Space [Member] Retail Space Retail Space [Member] Retail Space [Member] Number of apartment units Number of Units in Real Estate Property Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] CPLP CPLP [Member] CPLP [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Real estate assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Restricted cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash Notes and other receivables Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets Investment in unconsolidated joint ventures Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity Method Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity Method Investments Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Notes payable Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Accounts payable and accrued expenses Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Intangible liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Liabilities Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Nonredeemable noncontrolling interests (excluding CPLP) Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Total liabilities acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Total purchase price Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Commitments and Contingencies Disclosure [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Income Tax Disclosure [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Revenues Business Acquisition, Pro Forma Revenue Income from continuing operations Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax Net income Business Acquisition, Pro Forma Net Income (Loss) Net income available to common stockholders Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholder Business Acquisition, Pro Forma Net Income (Loss) Available to Common Stockholder Per share information: Earnings Per Share [Abstract] Basic (in usd per share) Business Acquisition, Pro Forma Earnings Per Share, Basic Diluted (in usd per share) Business Acquisition, Pro Forma Earnings Per Share, Diluted Future obligations under leases Contractual Obligation Outstanding letters of credit and performance bonds Outstanding Performance Bonds Outstanding performance bonds. Lease operating expenses Operating Leases, Rent Expense, Net Other Commitments [Table] Other Commitments [Table] Other Commitments [Axis] Other Commitments [Axis] Other Commitments [Domain] Other Commitments [Domain] Ground and Operating Lease Commitments Ground and Operating Lease Commitments [Member] Ground and Operating Lease Commitments [Member] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Ground Leases Ground Leases [Member] Ground Leases [Member] Other Commitments [Line Items] Other Commitments [Line Items] Future lease commitments Other Commitment Weighted average remaining term (in years) Lessee, Operating Lease, Term of Contract NOTES PAYABLE Debt Disclosure [Text Block] Preferred Stock Preferred Stock [Member] Number of shares issued during period Stock Issued During Period, Shares, New Issues Gross proceeds from issuance of common stock Proceeds from Issuance of Common Stock Stock issuance costs Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs Net proceeds from issuance of stock Stock Issued During Period, Value, New Issues Number of units redeemed in exchange for common stock (in shares) Stock Redeemed or Called During Period, Shares Aggregate value of units redeemed Stock Redeemed or Called During Period, Value Number of shares issued in merger Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Preferred stock, par value (in usd per share) Preferred Stock, Par or Stated Value Per Share Authorized repurchased amount (up to) Stock Repurchase Program, Authorized Amount Number of shares repurchased Stock Repurchased During Period, Shares Total cost of common stock repurchases, including broker commissions Payments for Repurchase of Common Stock, Including Commissions Payments for Repurchase of Common Stock, Including Commissions Percentage of restriction on ownership (more than) Percentage of Restrictions on Ownership of Company Common and Preferred Stock Percentage of restrictions on ownership of company total common and preferred stock. Leases [Abstract] Future minimum rentals to be received under existing non-cancelable leases Future Minimum Rentals to be Received under Existing Non Cancelable Leases [Table Text Block] Future minimum rentals to be received under existing non-cancelable leases. Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] CPLP Subsidiaries [Member] Other Noncontrolling Interests Other Noncontrolling Interests [Member] Other Noncontrolling Interests [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings per common share - basic: Earnings Per Share, Basic [Abstract] Numerator: Earnings Per Share Reconciliation [Abstract] Income from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net income attributable to other noncontrolling interests from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest Income from continuing operations available for common stockholders Income (Loss) from Continuing Operations Available to Common Stockholders Income (Loss) from Continuing Operations Available to Common Stockholders Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income available for common stockholders Net Income (Loss) Available to Common Stockholders, Basic Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average common shares - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Income from continuing operations available for common stockholders (in usd per share) Income (Loss) from Continuing Operations, Per Basic Share Income from discontinued operations available for common stockholders (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net income available to common stockholders (in usd per share) Earnings Per Share, Basic Earnings per common share - diluted: Earnings Per Share, Diluted [Abstract] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Income from continuing operations available for common stockholders Income (Loss) from Continuing Operations Available to Common Stockholders, Attributable to Parent Income (Loss) from Continuing Operations Available to Common Stockholders, Attributable to Parent Income from discontinued operations Net income available for common stockholders before net income attributable to noncontrolling interests in CPLP Net Income (Loss) Available to Common Stockholders, Diluted Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Add: Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] Potential dilutive common shares - stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted average units of CPLP convertible into common shares (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Weighted average common shares - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Income from continuing operations available for common stockholders (in usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Income from discontinued operations available for common stockholders (in usd per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income available to common stockholders (in usd per share) Earnings Per Share, Diluted Retirement Benefits [Abstract] Employer contribution matching percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employee vesting period in the retirement saving plan Vesting Period of Employer Contributions Vesting Period of Employer Contributions Company defined contribution plan Defined Contribution Plan, Employer Discretionary Contribution Amount Difference between income tax benefit (provision) and the amount computed by applying the statutory federal income tax rate to income before taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Tax effect of significant temporary differences representing deferred tax assets and liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Extinguishment of Debt [Axis] Extinguishment of Debt [Axis] Extinguishment of Debt, Type [Domain] Extinguishment of Debt, Type [Domain] Mortgage Debt Mortgages [Member] ACS Center ACS Center [Member] ACS Center [Member] 191 Peachtree Tower 191 Peachtree Tower [Member] 191 Peachtree Tower [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Amount of debt paid Extinguishment of Debt, Amount Gain (loss) on extinguishment of debt Gain (Loss) on Extinguishment of Debt Non-recourse mortgage loan Mortgage Loans on Real Estate, Face Amount of Mortgages Debt assumed that was repaid Repayments of Debt Notes payable prepayment penalty Notes payable prepayment penalty Notes payable prepayment penalty Outstanding amount Long-term Debt Assets pledged as security Pledged Assets, Not Separately Reported, Real Estate Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Spin-off Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Rental property revenues Disposal Group, Including Discontinued Operation, Rental Income Rental property operating expenses Disposal Group, Including Discontinued Operation, Operating Expense Other revenues Disposal Group, Including Discontinued Operation, Other Income Interest expense Disposal Group, Including Discontinued Operation, Interest Expense Depreciation and amortization Disposal Group, Including Discontinued Operation, Depreciation and Amortization Other expenses Disposal Group, Including Discontinued Operation, Other Expense Income from discontinued operations Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, Net of Tax Loss on sale of discontinued operations, net Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax Cash provided by operating activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Cash used in investing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations New Credit Facility Fourth Amended And Restated Credit Agreement [Member] Fourth Amended And Restated Credit Agreement [Member] Additional borrowing capacity Line Of Credit Facility, Additional Borrowing Capacity Line Of Credit Facility, Additional Borrowing Capacity Total borrowing availability Line of Credit Facility, Maximum Borrowing Capacity, Expansion Feature Line of Credit Facility, Maximum Borrowing Capacity, Expansion Feature Investment entity cap Line Of Credit, Investment Entity Cap Line Of Credit, Investment Entity Cap Secured leverage ratio (percent) Debt Instrument, Covenant Compliance, Secured Leverage Ratio Debt Instrument, Covenant Compliance, Secured Leverage Ratio REPORTABLE SEGMENTS Segment Reporting Disclosure [Text Block] Period in which the company capitalizes interest, real estate taxes and certain operating expenses on the unoccupied portion of recently completed properties, beginning with the date it is substantially complete (percent) Period of Time that Company Capitalizes Costs on Unoccupied Portion of Recently Completed Projects Minimum Average Economic Occupancy Percent Period of time that the company capitalizes costs on the unoccupied portion of recently completed projects-minimum average economic occupancy percent. Period in which the company capitalizes interest, real estate taxes and certain operating expenses on the unoccupied portion of recently completed properties, beginning with the date it is substantially complete (in years) Period of Time that Company Capitalizes Costs on Unoccupied Portion of Recently Completed Projects After Company Receives its Certificate of Occupancy Period of time that the company capitalizes costs on the unoccupied portion of recently completed projects after the company receives its certificate of occupancy. Buildings Building [Member] Furniture, Fixtures and Equipment Furniture and Fixtures [Member] Useful life Property, Plant and Equipment, Useful Life Reimbursement of rental revenue from tenants Tenant Reimbursements Statement of Financial Position [Abstract] Operating properties, accumulated depreciation Real Estate Investment Property, Accumulated Depreciation Notes and accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts, Premiums and Other Receivables Intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible liabilities, accumulated amortization Intangible Liabilities, Accumulated Amortization Intangible Liabilities, Accumulated Amortization Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value (in usd 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 Treasury stock, shares Treasury Stock, Shares REAL ESTATE AND ACCUMULATED DEPRECIATION SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Text Block] Number of Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted as a result of the Merger and Spin-Off (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Forfeited/Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding at end of period (in shares) Options Exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Per Option Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding at beginning of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted as a result of the Merger and Spin-Off (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Forfeited/Expired (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding at end of period (in usd per share) Options Exercisable at end of period (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Organization, Consolidation and Presentation of Financial Statements [Abstract] Percentage of partnership units owned by the Company Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest Company's portfolio of real estate assets - Office space (square feet) Company's Portfolio of Real Estate Assets Consist Office Space Company's portfolio of real estate assets - Total square footage of office portfolio. Company's portfolio of real estate assets - Retail space (square feet) Company's Portfolio of Real Estate Assets Consist Retail Space Company's portfolio of real estate assets - Total square footage of retail portfolio. Net amortization expense of intangible assets and liabilities Amortization of Intangible Assets Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net operating income from unconsolidated joint ventures Net operating income from unconsolidated joint ventures Net operating income from unconsolidated joint ventures Net operating income from discontinued operations Net operating income from discontinued operations Net operating income from discontinued operations Fee income Fee Income The aggregate revenue for property management, development and leasing services, including expense reimbursements, from all properties other than those in the third party management line of business Other income Other Revenue from Continuing Operations Other revenue from continuing operations. Reimbursed expenses Reimbursed Expenses Reimbursed expenses, other than those related to the third party management and leasing segment. General and administrative expenses Other General and Administrative Expense Total interest expense Interest Expense Depreciation and amortization Depreciation, Depletion and Amortization Acquisition and transaction costs Acquisition Costs, Period Cost Other Other Nonoperating Expense (Gain) loss on extinguishment of debt Income from unconsolidated joint ventures Gain on sale of investment properties Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Net Operating Income Operating Income (Loss) Supplemental Cash Flow Elements [Abstract] CONSOLIDATED STATEMENTS OF CASH FLOWS - SUPPLEMENTAL INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Parkway Stock conversion ratio Stockholders' Equity Note, Spinoff Transaction, Conversion Ratio Stockholders' Equity Note, Spinoff Transaction, Conversion Ratio Closing stock price (in usd per share) Business Acquisition, Share Price Fair value of assets and liabilities assumed Acquisition and merger costs Business Combination, Acquisition Related Costs Revenue contributed from the merger Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Net income contributed from the merger Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Transaction costs included in discontinued operations Disposal Group, Including Discontinued Operation, Transaction Costs Disposal Group, Including Discontinued Operation, Transaction Costs Carolina Square Holdings LP Carolina Square Holdings LP [Member] Carolina Square Holdings LP [Member] Northwood Ravin NR 123 Franklin LLC [Member] NR 123 Franklin LLC [Member] Maximum percentage guaranteed under construction loan Maximum Percentage Guaranteed Under Construction Loan Maximum percentage guaranteed under construction loan. Receivables [Abstract] Components of notes and accounts receivables Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Term Loan Unsecured Debt [Member] Unsecured term loan STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Leverage Ratios [Axis] Leverage Ratios [Axis] Leverage Ratios [Axis] Leverage Ratios [Domain] Leverage Ratios [Domain] Leverage Ratios [Domain] ≤ 35% Leverage Ratio Less Than Or Equal To Thirty Five Percent [Member] Leverage Ratio Less Than Or Equal To Thirty Five Percent [Member] More than 35% but ≤ 40% Leverage Ratio More Than Thirty Five Percent But Less Than Forty Percent [Member] Leverage Ratio More Than Thirty Five Percent But Less Than Forty Percent [Member] More than 40% but ≤ 45% Leverage Ratio More Than Forty Percent But Less Than Or Equal To Forty Five Percent [Member] Leverage Ratio More Than Forty Percent But Less Than Or Equal To Forty Five Percent [Member] More than 45% but ≤ 50% Leverage Ratio More Than Forty Five Percent But Less Than Or Equal To Fifty Percent [Member] Leverage Ratio More Than Forty Five Percent But Less Than Or Equal To Fifty Percent [Member] More than 50% Leverage Ratio More Than Fifty Percent [Member] Leverage Ratio More Than Fifty Percent [Member] Leverage Ratio Applicable % Spread Real Estate [Abstract] REAL ESTATE TRANSACTIONS Real Estate Disclosure [Text Block] EP I LLC EP I LLC [Member] EP I LLC. EP II LLC EP II LLC [Member] EP II LLC [Member] CL Realty, L.L.C. CL Realty LLC [Member] CL Realty, L.L.C. Courvoisier Centre JV, LLC Courvoisier Centre JV, LLC [Member] Courvoisier Centre JV, LLC [Member] HICO Victory Center LP HICO Victory Center LP [Member] HICO Victory Center LP [Member] Temco Associates, LLC Temco Associates LLC [Member] Temco Associates, LLC. DC Charlotte Plaza LLLP DC Charlotte Plaza LLLP [Member] DC Charlotte Plaza LLLP [Member] Wildwood Associates Wildwood Associates [Member] Wildwood Associates. 111 West Rio Building Other Other Equity Method Investee [Member] Other Equity Method Investee [Member] SUMMARY OF OPERATIONS Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] Total Revenues Equity Method Investment, Summarized Financial Information, Revenue Net Income (Loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) Company's Share of Net Income (Loss) Income (Loss) from Equity Method Investments Gross of Impairment Charges Income (Loss) from Equity Method Investments Gross of Impairment Charges Forestar Forestar [Member] Forestar. Assumptions used to estimate the fair value of the stock options and their results Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock options activity Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of restricted stock activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Summary of all performance-based RSU activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Schedule of other assets Schedule of Other Assets [Table Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] DFA Dimensional Fund Advisors [Member] Dimensional Fund Advisors [Member] 2018 Operating Leases, Future Minimum Payments Receivable, Current 2019 Operating Leases, Future Minimum Payments Receivable, in Two Years 2020 Operating Leases, Future Minimum Payments Receivable, in Three Years 2021 Operating Leases, Future Minimum Payments Receivable, in Four Years 2022 Operating Leases, Future Minimum Payments Receivable, in Five Years Thereafter Operating Leases, Future Minimum Payments Receivable, Thereafter Future minimum rents to be received Operating Leases, Future Minimum Payments Receivable Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Ending Period Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Year Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Filer Category Entity Filer Category Entity Public Float Entity Public Float Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-15 Accounting Standards Update 2016-15 [Member] Accounting Standards Update 2016-18 Accounting Standards Update 2016-18 [Member] Accounting Standards Update 2017-05 Accounting Standards Update 2017-05 [Member] Accounting Standards Update 2017-05 [Member] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Pronouncement, Early Adoption [Axis] New Accounting Principles, Early Adoption [Domain] New Accounting Principles, Early Adoption [Domain] New Accounting Pronouncement, Early Adoption, Effect New Accounting Pronouncement, Early Adoption, Effect [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Distributions in Excess of Cumulative Net Income Retained Earnings [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Increase (decrease) in net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Increase (decrease) in net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Cumulative effect from change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Summary of distribution of taxable income Schedule Reconciling Dividends Paid and Dividends Applied to Meet REIT Distribution Requirements [Table Text Block] Schedule reconciling dividends paid and dividends applied to meet REIT distribution requirements. Summary of components of the taxability of the Company's dividends Schedule of Components of Taxability of Company Dividends [Table Text Block] Schedule of components of taxability of company dividends. EARNINGS PER SHARE Earnings Per Share [Text Block] Notes payable, fair value Notes Payable, Fair Value Disclosure Time-vested RSUs Time-vested restricted stock units [Member] Time-vested restricted stock units [Member] RSUs Restricted Stock Units (RSUs) [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Employees Employees [Member] Employees [Member] Key Employee Key Employee [Member] Key Employee [Member] Supplier [Axis] Supplier [Axis] Share-based Goods and Nonemployee Services Transaction, Supplier [Domain] Share-based Goods and Nonemployee Services Transaction, Supplier [Domain] Independent Board of Directors Independent Board Of Directors [Member] Independent Board Of Directors [Member] Number of restricted stock units granted (in shares) Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Compensation expense, restricted stock Compensation Expense Restricted Stock Compensation expense, restricted stock. Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized compensation cost, period for recognition (in years) Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Fair value of restricted stock that vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Types of performance-based RSUs Types of performance-based RSUs Types of performance-based RSUs Payout range minimum Payout Range Minimum Payout range minimum. Payout range maximum Payout Range Maximum Payout range maximum. Targeted number of units outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Targeted Number of Units Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Targeted Number of Units Outstanding Estimate of future expense for all types of RSUs outstanding Estimate of Future Expense for All Types of RSUs Outstanding Estimate of future expense for all types of RSUs outstanding. Total cash paid for vesting and dividend payments Cash Paid for RSU Vesting and Dividend Payments Cash paid for RSU vesting and dividend payments. Recognized compensation expense related to RSUs for employees and directors, before capitalization or income tax benefit, if any Recognized Compensation Expense Related to RSUs For Employees and Directors Before Capitalization or Income Tax Benefit if Any Recognized compensation expense related to RSUs for employees and directors, before capitalization or income tax benefit, if any. Interest paid, net of amounts capitalized Interest Paid, Net Income taxes paid Income Taxes Paid, Net Non-Cash Transactions: Supplemental Cash Flow Information [Abstract] Transfer from investment in unconsolidated joint venture to operating properties Transfer From Investment In Unconsolidated Joint Ventures To Operating Properties Transfer From Investment In Unconsolidated Joint Ventures To Operating Properties Transfer from projects under development to operating properties Transfer from Projects Under Development to Operating Properties Transfer from Projects Under Development to Operating Properties Common stock dividends declared Dividends Payable Change in accrued property acquisition, development, and tenant asset expenditures Change in accrued property acquisition, development, and tenant asset expenditures Change in accrued property acquisition, development, and tenant asset expenditures Non-cash assets and liabilities assumed in Merger Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Non-cash assets and liabilities distributed in Spin-Off Noncash or Part Noncash Acquisition, Net Nonmonetary Assets and Liabilities Distributed Noncash or Part Noncash Acquisition, Net Nonmonetary Assets and Liabilities Distributed Mortgage note payable legally defeased Notes Reduction Transfer from land held to projects under development Transfer From Land Held To Projects Under Development Transfer From Land Held To Projects Under Development Transfer from investment in unconsolidated joint ventures to projects under development Transfer from investment in unconsolidated joint ventures to projects under development Transfer from investment in unconsolidated joint ventures to projects under development Transfer from operating properties and related assets to real estate assets and other assets held for sale Transfer from operating properties to operating properties and related assets held for sale Transfer from operating properties to operating properties and related assets held for sale Transfer from operating properties and related liabilities to liabilities of real estate assets held for sale Transfer from operating properties and related liabilities to liabilities of real estate assets held for sale Transfer from operating properties and related liabilities to liabilities of real estate assets held for sale FUTURE MINIMUM RENTS Lessor, Operating Leases [Text Block] Income Statement [Abstract] Revenues: Revenues [Abstract] Rental property revenues Fee income Other Total revenues Revenues Expenses: Costs and Expenses [Abstract] Rental property operating expenses Direct Costs of Leased and Rented Property or Equipment Reimbursed expenses General and administrative expenses Interest expense Total costs and expenses Costs and Expenses (Gain) loss on extinguishment of debt Income (loss) from continuing operations before unconsolidated joint ventures and gain (loss) on sale of investment properties Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income (loss) from continuing operations before gain on sale of investment properties Income (Loss) from Continuing Operations Before Gain on Sale of Investment Properties INCOME (LOSS) FROM CONTINUING OPERATIONS BEFORE GAIN ON SALE OF INVESTMENT PROPERTIES Gain on sale of investment properties Income from continuing operations Income from discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Income from discontinued operations Loss on sale from discontinued operations Income from discontinued operations Net income Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Net income attributable to controlling interests Per common share information — basic: Income from continuing operations for common stockholders (in usd per share) Income from discontinued operations for common stockholders (in usd per share) Per common share information — diluted: Income from continuing operations for common stockholders (in usd per share) Income from discontinued operations for common stockholders (in usd per share) Weighted average shares — basic Weighted average shares — diluted Dividends declared per common share (in usd per share) Common Stock, Dividends, Per Share, Declared Schedule of Variable Interest Entities [Table] Schedule of Variable Interest Entities [Table] Variable Interest Entities [Axis] Variable Interest Entities [Axis] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Classification [Domain] Variable Interest Entity, Primary Beneficiary Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Total assets Variable Interest Entity, Consolidated, Carrying Amount, Assets Summary of financial data and principal activities of unconsolidated joint ventures Equity Method Investments [Table Text Block] DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Atlanta Total Net Operating Income Summary of intangible assets Schedule of Intangible Assets and Goodwill [Table Text Block] Aggregate amortization of intangible assets and liabilities Future Amortization of Intangible Assets and Liabilities [Table Text Block] Aggregate amortization of intangible assets and liabilities for the next five years and thereafter by type, including weighted average remaining lease term. Summary of goodwill activity Schedule of Goodwill [Table Text Block] EP I, LLC and EP II, LLC EP I, LLC and EP II, LLC [Member] EP I, LLC and EP II, LLC [Member] Gables Gables Realty Limited [Member] Gables Realty Limited. Combined gross sales price Proceeds from Sale of Real Estate Held-for-investment Distribution received Proceeds from Equity Method Investment, Distribution Gain recorded in income from unconsolidated joint ventures Schedule of Finite-Lived Intangible Liabilities [Table] Schedule of Finite-Lived Intangible Liabilities [Table] Schedule of Finite-Lived Intangible Liabilities [Table] Finite-Lived Intangible Liabilities by Major Class [Axis] Finite-Lived Intangible Liabilities by Major Class [Axis] Finite-Lived Intangible Liabilities by Major Class [Axis] Finite-Lived Intangible Liabilities by Major Class [Domain] Finite-Lived Intangible Liabilities by Major Class [Domain] [Domain] for Finite-Lived Intangible Liabilities by Major Class [Axis] Below Market Rents Below-Market Leases [Member] Below-Market Leases [Member] Above Market Ground Lease Above Market Ground Leases [Member] Above Market Ground Leases [Member] Finite-Lived Intangible Liabilities [Line Items] Schedule of Finite-Lived Intangible Liabilities [Line Items] [Line Items] for Schedule of Finite-Lived Intangible Liabilities [Table] Future Amortization of Intangible Liabilities: Finite-Lived Intangible Liabilities, Net, Amortization, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Liabilities, Net, Amortization, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Liabilities, Amortization Expense, Next Twelve Months Finite-Lived Intangible Liabilities, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Liabilities, Amortization Expense, Year Two Finite-Lived Intangible Liabilities, Amortization Expense, Year Two 2020 Finite-Lived Intangible Liabilities, Amortization Expense, Year Three Finite-Lived Intangible Liabilities, Amortization Expense, Year Three 2021 Finite-Lived Intangible Liabilities, Amortization Expense, Year Four Finite-Lived Intangible Liabilities, Amortization Expense, Year Four 2022 Finite-Lived Intangible Liabilities, Amortization Expense, Year Five Finite-Lived Intangible Liabilities, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Liabilities, Amortization Expense, after Year Five Finite-Lived Intangible Liabilities, Amortization Expense, after Year Five Finite-lived intangible liabilities, net Finite-Lived Intangible Liabilities, Net Finite-Lived Intangible Liabilities, Net Weighted average remaining lease term Finite-Lived Intangible Liabilities, Remaining Amortization Period Finite-Lived Intangible Liabilities, Remaining Amortization Period Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Below Market Ground Lease Below-Market Ground Leases [Member] Below-Market Ground Leases [Member] Above Market Rents Above Market Leases [Member] In Place Leases Leases, Acquired-in-Place [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Future Amortization of Intangible Assets: Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2018 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-lived intangible assets, net Finite-Lived Intangible Assets, Net Weighted average remaining lease term Finite-Lived Intangible Assets, Remaining Amortization Period 2018 Intangible Assets and Liabilities Future Amortization Expense Year One Intangible assets and liabilities future amortization expense. 2019 Intangible Assets and Liabilities Future Amortization Expense Year Two Intangible assets and liabilities future amortization expense. 2020 Intangible Assets and Liabilities Future Amortization Expense Year Three Intangible assets and liabilities future amortization expense. 2021 Intangible Assets and Liabilities Future Amortization Expense Year Four Intangible assets and liabilities future amortization expense. 2022 Intangible Assets and Liabilities Future Amortization Expense Year Five Intangible assets and liabilities future amortization expense. Thereafter Intangible Assets and Liabilities Future Amortization Expense After Year Five Intangible assets and liabilities future amortization expense. Finite-lived intangibles, net Finite Lived Assets Intangible and Liabilities Future Amortization Expense Finite lived assets intangible and liabilities future amortization expense. Stock Options Employee Stock Option [Member] Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Assumed dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Assumed lives of option awards (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Assumed volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate RETIREMENT SAVINGS PLAN Pension and Other Postretirement Benefits Disclosure [Text Block] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] CTRS CTRS [Member] CTRS [Member] Income Taxes [Line Items] Income Taxes [Line Items] [Line Items] for Income Taxes [Table] Amount Effective Income Tax Rate Reconciliation, Amount [Abstract] Federal income tax benefit (expense) Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State income tax benefit (expense), net of federal income tax effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Change in deferred tax assets as a result of change in tax law Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Other Income Tax Reconciliation, State Deferred Tax Adjustment Income Tax Reconciliation, State Deferred Tax Adjustment Benefit applicable to income (loss) from continuing operations Income Tax Expense (Benefit) Rate Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal income tax benefit (expense) (percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State income tax benefit (expense), net of federal income tax effect (percent) Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Change in deferred tax assets as a result of change in tax law (percent) Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Valuation allowance (percent) Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent State deferred tax adjustment (percent) Income Tax Reconciliation, State Deferred Tax Adjustment, Percent Income Tax Reconciliation, State Deferred Tax Adjustment, Percent Benefit applicable to income (loss) from continuing operations (percent) Effective Income Tax Rate Reconciliation, Percent Total interest incurred Interest Costs Incurred Interest capitalized Capitalized Interest Costs, Including Allowance for Funds Used During Construction SUMMARY OF FINANCIAL POSITION Equity Method Investment Summarized Financial Information Financial Position [Abstract] Equity method investment summarized financial information financial position. Total Assets Equity Method Investment, Summarized Financial Information, Assets Total Debt Total Equity (Deficit) Equity Method Investment Summarized Financial Information, Equity Company's Investment Equity Method Investments Including those with Negative Balances The carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee, including those with credit balances. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. NOTES AND ACCOUNTS RECEIVABLE Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Hines Hines [Member] Hines [Member] Land funding requirement (percent) Land Funding Requirement Land Funding Requirement Future ownership percentage of partner in joint venture Future Ownership Percentage of Partner in Joint Venture Future Ownership Percentage of Partner in Joint Venture Term Loan, unsecured Senior Notes, unsecured Senior Unsecured Debt [Member] Senior Unsecured Debt [Member] Credit Facility, unsecured Unsecured Credit Facility [Member] Unsecured Credit Facility [Member] 3.91% Senior Unsecured Notes Three Point Ninety One Percent Senior Unsecured Notes [Member] Three Point Ninety One Percent Senior Unsecured Notes [Member] 4.09% Senior Unsecured Notes Four Point Zero Nine Percent Senior Unsecured Notes [Member] Four Point Zero Nine Percent Senior Unsecured Notes [Member] One Eleven Congress One Congress [Member] One Congress [Member] The American Cancer Society Center American Cancer Society Center Atlanta [Member] The American cancer society center Atlanta. San Jacinto Interest Rate (percent) Total Notes Payable, Gross Unamortized premium, net Debt Instrument, Unamortized Premium Unamortized loan costs Debt Issuance Costs, Net Total Notes Payable Weighted average maturity period of notes payable outstanding Debt Instrument, Weighted Average Maturity Period Debt Instrument, Weighted Average Maturity Period Schedule of amounts due under lease commitments Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Properties sold that qualify as discontinued operations Properties Sold that Qualify as Discontinued Operations [Table Text Block] Properties sold that qualify as discontinued operations. IBM IBM [Member] IBM [Member] Acres of land available for development or sale (acres) Acres of Land Available for Development or Sale Acres of land available for development or sale. Company's investment balance Supplemental information related to cash flows Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Reconciliation of cash, cash equivalents, and restricted cash Schedule of Cash and Cash Equivalents [Table Text Block] Reconciliation of cash, cash equivalents, and restricted cash Restrictions on Cash and Cash Equivalents [Table Text Block]