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Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture | $ 40,806 | $ 42,752 | $ 40,806 | $ 42,752 | $ 41,787 | $ 43,661
Cumulative distributions in excess of net income | (822,270) | (777,049) | (822,270) | (777,049) | (802,085) | (747,825)
Noncontrolling interests in subsidiaries | 66,280 | 67,339 | 66,280 | 67,339 | 66,165 | 72,267
Common units | 1,033 |  | 1,033 |  | 1,013 |
Equity in income of unconsolidated entities | 373 | 370 | 746 | 747 |  |
Income before gain on sales of real estate | 21,108 | 18,847 | 39,892 | 37,349 |  |
Net income | 21,085 | 18,859 | 39,865 | 41,599 |  |
Net income attributable to noncontrolling interests - Common units in COPLP | (608) | (261) | (1,152) | (883) |  |
Net income attributable to COPT/COPLP | 19,434 | 17,526 | 36,584 | 38,545 |  |
Net income attributable to COPT/COPLP common share/unit holders | 19,434 | 7,640 | 36,584 | 25,479 |  |
Comprehensive income | 22,950 | 18,039 | 46,651 | 42,187 |  |
Comprehensive income attributable to COPT/ COPLP | 21,242 | 16,733 | 43,153 | 39,113 |  |
Corporate Office Properties, L.P. |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture | 40,806 | 42,752 | 40,806 | 42,752 | 41,787 | 43,661
Noncontrolling interests in subsidiaries | 12,875 |  | 12,875 |  | 12,312 |
Common units | 1,477,575 | 1,416,995 | 1,477,575 | 1,416,995 | 1,445,022 | 1,419,710
Equity in income of unconsolidated entities | 373 | 370 | 746 | 747 |  |
Income before gain on sales of real estate | 21,108 | 18,847 | 39,892 | 37,349 |  |
Net income | 21,085 | 18,859 | 39,865 | 41,599 |  |
Net income attributable to COPT/COPLP | 20,207 | 17,952 | 38,066 | 39,758 |  |
Net income attributable to COPT/COPLP common share/unit holders | 20,042 | 7,901 | 37,736 | 26,362 |  |
Comprehensive income | 22,950 | 18,039 | 46,651 | 42,187 |  |
Comprehensive income attributable to COPT/ COPLP | $ 22,072 | 17,132 | $ 44,852 | 40,346 |  |
As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 25,335 |  | 25,335 | 25,066 | 25,548
Cumulative distributions in excess of net income |  | (793,828) |  | (793,828) | (818,190) | (765,276)
Noncontrolling interests in subsidiaries |  | 66,701 |  | 66,701 | 65,549 | 71,605
Equity in income of unconsolidated entities |  | 718 |  | 1,443 |  |
Income before gain on sales of real estate |  | 19,195 |  | 38,045 |  |
Net income |  | 19,207 |  | 42,295 |  |
Net income attributable to noncontrolling interests - Common units in COPLP |  | (273) |  | (907) |  |
Net income attributable to COPT/COPLP |  | 17,862 |  | 39,217 |  |
Net income attributable to COPT/COPLP common share/unit holders |  | 7,976 |  | 26,151 |  |
Comprehensive income |  | 18,387 |  | 42,883 |  |
Comprehensive income attributable to COPT/ COPLP |  | 17,069 |  | 39,785 |  |
As Previously Reported | Corporate Office Properties, L.P. |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 25,335 |  | 25,335 | 25,066 | 25,548
Common units |  | 1,399,578 |  | 1,399,578 | 1,428,301 | 1,401,597
Equity in income of unconsolidated entities |  | 718 |  | 1,443 |  |
Income before gain on sales of real estate |  | 19,195 |  | 38,045 |  |
Net income |  | 19,207 |  | 42,295 |  |
Net income attributable to COPT/COPLP |  | 18,300 |  | 40,454 |  |
Net income attributable to COPT/COPLP common share/unit holders |  | 8,249 |  | 27,058 |  |
Comprehensive income |  | 18,387 |  | 42,883 |  |
Comprehensive income attributable to COPT/ COPLP |  | 17,480 |  | 41,042 |  |
Accounting Standards Update 2017-05 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 17,417 |  | 17,417 | 16,721 | 18,113
Cumulative distributions in excess of net income |  | 16,779 |  | 16,779 | 16,105 | 17,451
Noncontrolling interests in subsidiaries |  | 638 |  | 638 | 616 | 662
Equity in income of unconsolidated entities |  | (348) |  | (696) |  |
Income before gain on sales of real estate |  | (348) |  | (696) |  |
Net income |  | (348) |  | (696) |  |
Net income attributable to noncontrolling interests - Common units in COPLP |  | 12 |  | 24 |  |
Net income attributable to COPT/COPLP |  | (336) |  | (672) |  |
Net income attributable to COPT/COPLP common share/unit holders |  | (336) |  | (672) |  |
Comprehensive income |  | (348) |  | (696) |  |
Comprehensive income attributable to COPT/ COPLP |  | (336) |  | (672) |  |
Accounting Standards Update 2017-05 | Corporate Office Properties, L.P. |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 17,417 |  | 17,417 | 16,721 | 18,113
Common units |  | 17,417 |  | 17,417 | $ 16,721 | $ 18,113
Equity in income of unconsolidated entities |  | (348) |  | (696) |  |
Income before gain on sales of real estate |  | (348) |  | (696) |  |
Net income |  | (348) |  | (696) |  |
Net income attributable to COPT/COPLP |  | (348) |  | (696) |  |
Net income attributable to COPT/COPLP common share/unit holders |  | (348) |  | (696) |  |
Comprehensive income |  | (348) |  | (696) |  |
Comprehensive income attributable to COPT/ COPLP |  | $ (348) |  | $ (696) |  |

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