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Investment in and Advances to Non-Consolidated Entities - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
property
Feb. 28, 2017
USD ($)
Jan. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 31, 2017
Investments in and Advances to Affiliates [Line Items]              
Aggregate gain on sale of properties       $ 252,913 $ 63,428 $ 81,510  
Impairment charges on real estate       36,620 18,023    
Investment advisory fees       30,608 31,809 31,431  
Lexington Reality Advisors Inc [Member] | Investment Advice [Member]              
Investments in and Advances to Affiliates [Line Items]              
Investment advisory fees       $ 1,443 807 $ 693  
Palm Beach Gardens, Florida [Member]              
Investments in and Advances to Affiliates [Line Items]              
Impairment charges on real estate         $ 3,512    
Oklahoma City, Oklahoma [Member] | Tenant-in-Common [Member]              
Investments in and Advances to Affiliates [Line Items]              
Proceeds from divestiture of interest in joint venture   $ 6,198          
Co-venture equity ownership percentage             40.00%
Aggregate gain on sale of properties   1,452          
Office Building [Member]              
Investments in and Advances to Affiliates [Line Items]              
Proceeds from divestiture of interest in joint venture $ 4,312            
Number of properties sold | property 6            
Aggregate gain on sale of properties   $ 1,777          
Office Building [Member] | Russellville, Arkansas [Member]              
Investments in and Advances to Affiliates [Line Items]              
Proceeds from divestiture of interest in joint venture     $ 6,681        
Aggregate gain on sale of properties     $ 5,378