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Summary of Significant Accounting Policies (Details 3) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 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 | $ 40,318 | $ 42,263 | $ 40,318 | $ 42,263 | $ 41,787 | $ 43,661
Cumulative distributions in excess of net income | (833,508) | (783,848) | (833,508) | (783,848) | (802,085) | (747,825)
Noncontrolling interests in subsidiaries | 41,557 | 44,716 | 41,557 | 44,716 | 66,165 | 72,267
Common units | 1,088 |  | 1,088 |  | 1,013 |
Equity in income of unconsolidated entities | 374 | 371 | 1,120 | 1,118 |  |
Net income | 20,322 | 22,334 | 60,187 | 63,933 |  |
Net income attributable to noncontrolling interests - Common units in COPLP | (380) | (693) | (1,532) | (1,576) |  |
Net income attributable to COPT/COPLP | 18,697 | 20,579 | 55,281 | 59,124 |  |
Net income attributable to COPT/COPLP common share/unit holders | 18,697 | $ 20,579 | 55,281 | $ 46,058 |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.21 |  | $ 0.46 |  |
Comprehensive income | 21,440 | $ 22,648 | 68,091 | $ 64,835 |  |
Comprehensive income attributable to COPT/ COPLP | 19,793 | 20,883 | 62,946 | 59,996 |  |
Corporate Office Properties, L.P. |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture | 40,318 | 42,263 | 40,318 | 42,263 | 41,787 | 43,661
Noncontrolling interests in subsidiaries | 13,277 |  | 13,277 |  | 12,312 |
Common units | 1,577,299 | 1,411,980 | 1,577,299 | 1,411,980 | 1,445,022 | 1,419,710
Equity in income of unconsolidated entities | 374 | 371 | 1,120 | 1,118 |  |
Net income | 20,322 | 22,334 | 60,187 | 63,933 |  |
Net income attributable to COPT/COPLP | 19,242 | 21,437 | 57,308 | 61,195 |  |
Net income attributable to COPT/COPLP common share/unit holders | 19,077 | $ 21,272 | 56,813 | $ 47,634 |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.21 |  | $ 0.46 |  |
Comprehensive income | 21,440 | $ 22,648 | 68,091 | $ 64,835 |  |
Comprehensive income attributable to COPT/ COPLP | $ 20,360 | 21,751 | $ 65,212 | 62,097 |  |
As Previously Reported |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 25,194 |  | 25,194 | 25,066 | 25,548
Cumulative distributions in excess of net income |  | (800,290) |  | (800,290) | (818,190) | (765,276)
Noncontrolling interests in subsidiaries |  | 44,089 |  | 44,089 | 65,549 | 71,605
Equity in income of unconsolidated entities |  | 719 |  | 2,162 |  |
Net income |  | 22,682 |  | 64,977 |  |
Net income attributable to noncontrolling interests - Common units in COPLP |  | (704) |  | (1,611) |  |
Net income attributable to COPT/COPLP |  | 20,916 |  | 60,133 |  |
Net income attributable to COPT/COPLP common share/unit holders |  | $ 20,916 |  | $ 47,067 |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.21 |  | $ 0.47 |  |
Comprehensive income |  | $ 22,996 |  | $ 65,879 |  |
Comprehensive income attributable to COPT/ COPLP |  | 21,220 |  | 61,005 |  |
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 |  | 25,194 |  | 25,194 | 25,066 | 25,548
Common units |  | 1,394,911 |  | 1,394,911 | 1,428,301 | 1,401,597
Equity in income of unconsolidated entities |  | 719 |  | 2,162 |  |
Net income |  | 22,682 |  | 64,977 |  |
Net income attributable to COPT/COPLP |  | 21,785 |  | 62,239 |  |
Net income attributable to COPT/COPLP common share/unit holders |  | $ 21,620 |  | $ 48,678 |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.21 |  | $ 0.47 |  |
Comprehensive income |  | $ 22,996 |  | $ 65,879 |  |
Comprehensive income attributable to COPT/ COPLP |  | 22,099 |  | 63,141 |  |
Accounting Standards Update 2017-05 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Investment in unconsolidated real estate joint venture |  | 17,069 |  | 17,069 | 16,721 | 18,113
Cumulative distributions in excess of net income |  | 16,442 |  | 16,442 | 16,105 | 17,451
Noncontrolling interests in subsidiaries |  | 627 |  | 627 | 616 | 662
Equity in income of unconsolidated entities |  | (348) |  | (1,044) |  |
Net income |  | (348) |  | (1,044) |  |
Net income attributable to noncontrolling interests - Common units in COPLP |  | 11 |  | 35 |  |
Net income attributable to COPT/COPLP |  | (337) |  | (1,009) |  |
Net income attributable to COPT/COPLP common share/unit holders |  | $ (337) |  | $ (1,009) |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.00 |  | $ (0.01) |  |
Comprehensive income |  | $ (348) |  | $ (1,044) |  |
Comprehensive income attributable to COPT/ COPLP |  | (337) |  | (1,009) |  |
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 |  | 17,069 |  | 17,069 | 16,721 | 18,113
Common units |  | 17,069 |  | 17,069 | $ 16,721 | $ 18,113
Equity in income of unconsolidated entities |  | (348) |  | (1,044) |  |
Net income |  | (348) |  | (1,044) |  |
Net income attributable to COPT/COPLP |  | (348) |  | (1,044) |  |
Net income attributable to COPT/COPLP common share/unit holders |  | $ (348) |  | $ (1,044) |  |
Earnings per common share/unit - basic and diluted (in dollars per share) |  | $ 0.00 |  | $ (0.01) |  |
Comprehensive income |  | $ (348) |  | $ (1,044) |  |
Comprehensive income attributable to COPT/ COPLP |  | $ (348) |  | $ (1,044) |  |

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