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Investment in Unconsolidated Real Estate - Additional Information (Detail)
$ in Thousands
12 Months Ended
Jul. 06, 2016
USD ($)
Nov. 17, 2014
USD ($)
Dec. 31, 2016
USD ($)
property
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 05, 2016
Schedule Of Equity Method Investments [Line Items]            
Number of real estate properties | property     136      
Sale of property at contract price   $ 54,500        
Repayments of outstanding loan secured   41,500        
Gain on sale of property   13,389 $ 3,458 $ 0 $ 13,389  
Payment of customary closing expenses   $ 1,700 5,530 0 1,745  
Payments to Acquire Real Estate     367,621 230,599 383,662  
Investment in unconsolidated real estate entities     0 4,087    
Investment recorded at estimated fair value, basis adjustment.     0 632    
Management, leasing and development fees     $ 100 $ 200 $ 400  
Mission Oaks Boulevard            
Schedule Of Equity Method Investments [Line Items]            
Ownership Interest     15.00%      
Number of real estate properties | property     3      
3255 Mission Oaks Blvd            
Schedule Of Equity Method Investments [Line Items]            
Payment of customary closing expenses     $ 5,500      
Payments to Acquire Real Estate $ 25,700          
Percentage of voting interests acquired 85.00%   100.00%      
Write Off Of Unamortized Basis Adjustment $ 600          
Investment in unconsolidated real estate entities 3,600          
Excess distributions, realized gain $ 1,900          
3255 Mission Oaks Blvd | 3255 Mission Oaks Blvd            
Schedule Of Equity Method Investments [Line Items]            
Percentage of voting interests acquired           15.00%