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Investment in Unconsolidated Joint Ventures - Narrative (Details)
$ in Thousands
9 Months Ended
Feb. 10, 2014
USD ($)
Jan. 24, 2014
USD ($)
Sep. 30, 2015
USD ($)
equity_investment
property
Sep. 30, 2014
USD ($)
Dec. 19, 2013
Schedule of Equity Method Investments [Line Items]          
Number of unconsolidated joint ventures | equity_investment     2    
Investment in unconsolidated joint ventures     $ 3,247 $ 3,417  
Gain on sale of real estate       $ 6,300  
CalSTRS | CalSTRS Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Former interest (as a percent) 60.00%        
Payments to acquire former interest in joint venture $ 24,900        
Austin Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (as a percent)         33.00%
Austin Joint Venture | Madison          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (as a percent)         50.00%
CalSTRS Joint Venture          
Schedule of Equity Method Investments [Line Items]          
Ownership interest (as a percent) 40.00%        
Additional interest acquired (in percent)   17.00%      
Investment in unconsolidated joint ventures   $ 41,500      
CalSTRS Joint Venture | CalSTRS          
Schedule of Equity Method Investments [Line Items]          
Company's ownership (as a percent) 60.00%        
Consolidated Properties          
Schedule of Equity Method Investments [Line Items]          
Number of office and parking properties | property     35