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Subsequent Events (Details)
Feb. 05, 2016
USD ($)
property
Jan. 22, 2016
USD ($)
Apr. 10, 2014
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Subsequent Event [Line Items]          
Gross asset value       $ 21,373,000 $ 24,079,000
Miami, Florida | Office Building | Courvoisier Centre          
Subsequent Event [Line Items]          
Number of real estate properties | property     2    
Subsequent Event | Houston, Texas | Office Building | 5300 Memorial          
Subsequent Event [Line Items]          
Proceeds from sale of real estate   $ 33,000,000      
Subsequent Event | Houston, Texas | Office Building | Town & Country          
Subsequent Event [Line Items]          
Proceeds from sale of real estate   $ 27,000,000      
Subsequent Event | Miami, Florida | Office Building | Courvoisier Centre          
Subsequent Event [Line Items]          
Proceeds from sale of real estate $ 154,300,000        
Percentage of interest sold 80.00%        
Number of real estate properties | property 2        
Gross asset value $ 175,000,000        
Interest rate on mortgage (in percent) 4.60%        
Ownership percentage of noncontrolling interest 20.00%        
Subsequent Event | Miami, Florida | Office Building | Courvoisier Centre | First Mortgage          
Subsequent Event [Line Items]          
Balance of the mortgage loan $ 106,500,000.0