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Investments in Unconsolidated Joint Ventures - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
a
ft²
bldg
room
story
Dec. 31, 2015
USD ($)
a
ft²
bldg
room
story
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jun. 30, 2014
investment
Jan. 01, 2013
Schedule of Equity Method Investments [Line Items]            
Gain (Loss) on Sale of Properties   $ 100,314,000 $ 91,778,000 $ 98,651,000    
Gross Proceeds   530,440,000 559,322,000 526,949,000    
Company's net investment in unconsolidated joint ventures $ 218,454,000 218,454,000 208,832,000      
Impairment - real estate assets   18,244,000 117,000 248,000    
Development in progress 360,948,000 360,948,000 277,411,000      
Company's net investment in unconsolidated joint ventures 218,454,000 218,454,000 208,832,000 [1]      
Liberty Venture I, LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures $ 11,563,000 $ 11,563,000 20,010,000 [1]      
Liberty Venture I, LP [Member] | New Jersey [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 25.00% 25.00%        
Leaseable square feet (unaudited) | ft² 3,700,000 3,700,000        
Liberty Venture I, LP [Member] | New Jersey [Member] | Land and Land Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Acres of developable land (unaudited) | a 36 36        
Liberty Venture I, LP [Member] | New Jersey [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Leaseable square feet (unaudited) | a 198,000 198,000        
Gross Proceeds   $ 8,500,000        
Liberty Venture I, LP [Member] | New Jersey [Member] | Building and Building Improvements [Member] | Not Discontinued Operations [Member] | Joint venture sales, 2015 [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 1 1        
Liberty Venture I, LP [Member] | New Jersey [Member] | Building and Building Improvements [Member] | Industrial Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 26 26        
Liberty Venture I, LP [Member] | New Jersey [Member] | Construction in Progress [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 2 2        
Leaseable square feet (unaudited) | ft² 825,000 825,000        
Anticipated aggregate investment $ 54,200,000 $ 54,200,000        
Kings Hill Unit Trust [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures $ 6,789,000 $ 6,789,000 11,663,000 [1]      
Kings Hill Unit Trust [Member] | United Kingdom [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 20.00% 20.00%        
Kings Hill Unit Trust [Member] | United Kingdom [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Leaseable square feet (unaudited) | ft² 490,000 490,000        
Kings Hill Unit Trust [Member] | United Kingdom [Member] | Building and Building Improvements [Member] | Industrial Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 3 3        
Kings Hill Unit Trust [Member] | United Kingdom [Member] | Building and Building Improvements [Member] | Office Building [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 11 11        
Liberty Illinois, LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures $ 18,221,000 $ 18,221,000 18,692,000 [1]      
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 25.00% 25.00%        
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member] | Land and Land Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Acres of developable land (unaudited) | a 248 248        
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Leaseable square feet (unaudited) | ft² 5,100,000 5,100,000        
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member] | Building and Building Improvements [Member] | Industrial Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 15 15        
Liberty Illinois, LP [Member] | Chicago Milwaukee [Member] | Construction in Progress [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 1 1        
Leaseable square feet (unaudited) | ft² 430,000 430,000        
Anticipated aggregate investment $ 24,600,000 $ 24,600,000        
Blythe Valley JV Sarl [Member] | United Kingdom [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage           20.00%
Company's net investment in unconsolidated joint ventures       $ 0    
Liberty Washington, LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures $ 55,552,000 $ 55,552,000 69,230,000 [1]      
Liberty Washington, LP [Member] | Northern Virginia and Washington DC [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 25.00% 25.00%        
Impairment - real estate assets     172,700,000      
Liberty Washington, LP [Member] | Northern Virginia and Washington DC [Member] | Land and Land Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Acres of developable land (unaudited) | a 6 6        
Liberty Washington, LP [Member] | Northern Virginia and Washington DC [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Leaseable square feet (unaudited) | ft² 2,300,000 2,300,000        
Liberty Washington, LP [Member] | Northern Virginia and Washington DC [Member] | Building and Building Improvements [Member] | Office Building [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 20 20        
Liberty Washington, LP [Member] | Northern Virginia [Member]            
Schedule of Equity Method Investments [Line Items]            
Impairment - real estate assets   $ 56,800,000        
Liberty Washington, LP [Member] | Northern Virginia [Member] | Mortgages [Member]            
Schedule of Equity Method Investments [Line Items]            
Debt Instrument, Debt Default, Amount $ 46,400,000 $ 46,400,000        
Liberty Washington, LP [Member] | Northern Virginia [Member] | Building and Building Improvements [Member] | Not Discontinued Operations [Member] | Joint venture sales, 2015 [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 1 1        
Leaseable square feet (unaudited) | a 80,000 80,000        
Gross Proceeds $ 5,000,000          
Liberty Comcast 1701 JFK Boulevard, LP [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures $ 20,465,000 $ 20,465,000 23,153,000 [1],[2]      
Liberty Comcast 1701 JFK Boulevard, LP [Member] | Philadelphia [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 20.00% 20.00%        
Liberty Comcast 1701 JFK Boulevard, LP [Member] | Philadelphia [Member] | Investments in and advances to unconsolidated joint ventures [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]            
Schedule of Equity Method Investments [Line Items]            
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 20,500,000 $ 20,500,000 23,200,000      
Liberty Comcast 1701 JFK Boulevard, LP [Member] | Philadelphia [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 1 1        
Leaseable square feet (unaudited) | ft² 1,250,000 1,250,000        
Liberty Property 18th & Arch [Member]            
Schedule of Equity Method Investments [Line Items]            
Company's net investment in unconsolidated joint ventures [1],[3] $ 62,700,000 $ 62,700,000        
Company's net investment in unconsolidated joint ventures $ 62,677,000 $ 62,677,000 $ 21,292,000 [1],[4]      
Liberty Property 18th & Arch [Member] | Philadelphia [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of equity method investments | investment         2  
Ownership Percentage 20.00% 20.00%        
Anticipated investment in joint ventures $ 186,000,000 $ 186,000,000        
Development in progress $ 323,600,000 $ 323,600,000        
Liberty Property 18th & Arch [Member] | Philadelphia [Member] | Construction in Progress [Member]            
Schedule of Equity Method Investments [Line Items]            
Leaseable square feet (unaudited) | ft² 1,300,000 1,300,000        
Anticipated aggregate investment $ 932,000,000 $ 932,000,000        
Number of stories in a high-rise building | story 59 59        
Number of hotel rooms | room 222 222        
Liberty AIPO, LP [Member] | Orlando [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 50.00% 50.00%        
Liberty AIPO, LP [Member] | Orlando [Member] | Building and Building Improvements [Member] | Industrial Property [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 4 4        
Liberty AIPO, LP [Member] | Orlando [Member] | Construction in Progress [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 2 2        
Leaseable square feet (unaudited) | ft² 369,000 369,000        
Anticipated aggregate investment $ 20,300,000 $ 20,300,000        
Silversword Properties Ltd [Member] | United Kingdom [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 50.00% 50.00%        
Silversword Properties Ltd [Member] | United Kingdom [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 1 1        
Cambridge Medipark Ltd [Member] | United Kingdom [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 50.00% 50.00%        
Cambridge Medipark Ltd [Member] | United Kingdom [Member] | Building and Building Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Number of buildings | bldg 0 0        
Liberty Property 19th & Arch LP [Member] | Philadelphia [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership Percentage 50.00% 50.00%        
Liberty Property 19th & Arch LP [Member] | Philadelphia [Member] | Land and Land Improvements [Member]            
Schedule of Equity Method Investments [Line Items]            
Acres of developable land (unaudited) | a 1 1        
[1] Differences between the Company's net investment in unconsolidated joint ventures and its underlying equity in the net assets of the venture are primarily a result of impairments related to the Company's investment in unconsolidated joint ventures, the deferral of gains associated with the sales of properties to joint ventures in which the Company retains an ownership interest and loans made to the joint ventures by the Company. These adjustments have resulted in an aggregate difference reducing the Company's investments in unconsolidated joint ventures by $4.5 million as of December 31, 2015 and increasing the Company's investment in unconsolidated joint ventures by $3.2 million as of December 31, 2014. Differences between historical cost basis and the basis reflected at the joint venture level (other than loans) are typically depreciated over the life of the related asset.
[2] The Company's maximum exposure to loss is equal to the Company's net investment in unconsolidated joint ventures as of December 31, 2015 and 2014, respectively.
[3] Other income/(expense) for this joint venture reflects forgiveness of related party debt between the joint venture and its investment partners consistent with each partner's equity ownership.
[4] Represents the combined results of two joint ventures related to the property at 18th and Arch Streets, Philadelphia.