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DEBT - Narrative (Detail)
1 Months Ended
Jun. 30, 2016
USD ($)
loan
May 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
extension_option
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Nov. 02, 2015
USD ($)
Debt            
Deferred loan costs, gross       $ 7,117,000 $ 10,445,000  
Deferred loan costs, accumulated amortization       (1,523,000) (4,332,000)  
Accrued interest and unused commitment fee payable       2,897,000 1,688,000  
Mortgages Payable            
Debt            
Number of mortgage loan agreements entered into | loan 6          
Amount of loan $ 392,000,000          
Unsecured credit facility entered into in September 2014            
Debt            
Maximum borrowing capacity     $ 850,000,000      
Number of extension options | extension_option     2      
Line of credit facility extension option term     1 year      
Amount available for future borrowings       200,000,000 450,000,000  
Amount outstanding under the facility       0 107,000,000  
Unsecured credit facility entered into in September 2014, revolver            
Debt            
Maximum borrowing capacity     $ 450,000,000      
Unused commitment fee dependent upon amount of aggregate unused commitments, one (as a percent)     0.15%      
Unused commitment fee dependent upon amount of aggregate unused commitments, two (as a percent)     0.25%      
Amount outstanding under the facility         0  
Unsecured credit facility entered into in September 2014, revolver | Minimum            
Debt            
Interest rate margin     0.20%      
Unsecured credit facility entered into in September 2014, revolver | Maximum            
Debt            
Interest rate margin     1.00%      
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Minimum            
Debt            
Interest rate margin     1.20%      
Unsecured credit facility entered into in September 2014, revolver | LIBOR | Maximum            
Debt            
Interest rate margin     2.00%      
Unsecured credit facility entered into in September 2014, term loan            
Debt            
Maximum borrowing capacity     $ 325,000,000      
Amount outstanding under the facility         $ 107,000,000  
Interest rate (as a percent)         1.57%  
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Minimum            
Debt            
Interest rate margin     1.15%      
Unsecured credit facility entered into in September 2014, term loan | LIBOR | Maximum            
Debt            
Interest rate margin     1.95%      
Unsecured credit facility entered into in September 2014, term loan | Base rate | Minimum            
Debt            
Interest rate margin     0.15%      
Unsecured credit facility entered into in September 2014, term loan | Base rate | Maximum            
Debt            
Interest rate margin     0.95%      
Unsecured credit facility entered into in September 2014, delayed-draw term loan            
Debt            
Maximum borrowing capacity     $ 75,000,000      
Unused line fee (as a percent)     0.25%      
Unsecured term facility entered into in May 2015            
Debt            
Maximum borrowing capacity   $ 385,000,000        
Unused line fee (as a percent)   0.20%        
Amount outstanding under the facility       $ 385,000,000 $ 385,000,000  
Interest rate (as a percent)       2.12% 1.84%  
Amount of loan           $ 385,000,000
Prepayment fee, percentage   2.00%        
Effective interest rate       3.16% 3.16%  
Unsecured term facility entered into in May 2015 | LIBOR | Minimum            
Debt            
Interest rate margin   1.60%        
Unsecured term facility entered into in May 2015 | LIBOR | Maximum            
Debt            
Interest rate margin   2.25%        
Unsecured term facility entered into in May 2015 | Base rate | Minimum            
Debt            
Interest rate margin   0.60%        
Unsecured term facility entered into in May 2015 | Base rate | Maximum            
Debt            
Interest rate margin   1.25%