Annual report pursuant to Section 13 and 15(d)

Real Estate Joint Ventures (Details)

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Real Estate Joint Ventures (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Investments in consolidated real estate joint ventures      
Amounts advanced to fund Huntsville infrastructure costs $ 53,663,000 $ 35,798,000  
Investment Balance 0 (6,420,000)  
Gain on disposal 0 0 2,452,000
LW Redstone Company, LLC
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 85.00%    
Number of buildings operated by the joint venture 3    
Total Assets 132,170,000 [1],[2]    
Encumbered Assets 67,487,000 [1],[2]    
Total Liabilities 39,845,000 [1],[2]    
Amounts advanced to fund Huntsville infrastructure costs 44,100,000    
Partner's capital account upon formation 9,000,000    
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company 85.00%    
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners 15.00%    
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value 5 years    
Construction commencement threshold (in square feet) 4,400,000    
LW Redstone Company, LLC | Maximum
      
Investments in consolidated real estate joint ventures      
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars) 76,000,000    
M Square Associates, LLC
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 50.00%    
Number of buildings operated by the joint venture 2    
Total Assets 60,919,000 [1],[3]    
Encumbered Assets 48,705,000 [1],[3]    
Total Liabilities 41,009,000 [1],[3]    
Percentage of residual amounts distributed to each member 50.00%    
COPT-FD Indian Head, LLC
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 75.00%    
Total Assets 6,436,000 [1],[4]    
Total Liabilities 0 [1],[4]    
Consolidated real estate joint ventures
      
Investments in consolidated real estate joint ventures      
Total Assets 199,525,000 [1]    
Encumbered Assets 116,192,000 [1]    
Total Liabilities 80,854,000 [1]    
Arundel Preserve 5, LLC
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent)   50.00%  
Arundel Preserve 5, LLC | Common Shares
      
Investments in consolidated real estate joint ventures      
Stock Issued During Period, Shares, Acquisitions 221,501    
Stock Issued During Period, Value, Acquisitions 5,200,000    
MOR Forbes 2 LLC
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent) 50.00%    
Unconsolidated real estate joint ventures
      
Investments in consolidated real estate joint ventures      
Ownership (as a percent)   20.00%  
Number of buildings operated by the joint venture   16  
Investment Balance   (6,400,000)  
Gain on disposal 6,300,000    
Difference between carrying amount of investment and share of the equity in the joint venture   4,500,000  
Condensed balance sheets for unconsolidated real estate joint venture      
Properties, net   58,460,000  
Other assets   4,376,000  
Total assets   62,836,000  
Liabilities (primarily debt)   72,693,000  
Owners' equity   (9,857,000)  
Total liabilities and owners' equity   62,836,000  
Condensed statements of operations for unconsolidated real estate joint venture      
Revenues 6,519,000 7,316,000 7,577,000
Property operating expenses (2,818,000) (2,829,000) (3,673,000)
Interest expense (10,463,000) (7,672,000) (3,913,000)
Depreciation and amortization expense (2,067,000) (2,283,000) (2,463,000)
Gain on early extinguishment of debt 23,013,000 0 0
Net income (loss) 14,184,000 (5,468,000) (2,472,000)
Unconsolidated real estate joint ventures | Nonrecourse loan guarantees of unconsolidated partnership | Nonrecourse mezzanine loan
      
Investments in consolidated real estate joint ventures      
Nonrecourse Mezzanine Debt Balance, equity method joint venture $ 5,600,000    
[1] Excludes amounts eliminated in consolidation.
[2] This joint venture’s property is in Huntsville, Alabama.
[3] This joint venture’s properties are in College Park, Maryland (in the Baltimore/Washington Corridor).
[4] This joint venture’s property is in Charles County, Maryland. In 2012, the joint venture exercised its option under a development agreement to require Charles County to repurchase the land parcel at its original acquisition cost. Under the terms of the agreement with Charles County, the repurchase is expected to occur by August 2014.