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Equity - Vesting Schedule of the Nonvested Shares of Restricted Stock Outstanding (Detail) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
TSR Target Percentage   50.00%  
Performance period 3 years    
Restricted Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 257,867 257,867 287,827
Restricted Common Stock | October 1, 2017 - December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 81,993 81,993  
Restricted Common Stock | 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 69,720 69,720  
Restricted Common Stock | 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 50,182 50,182  
Restricted Common Stock | 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 36,657 36,657  
Restricted Common Stock | 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 19,315 19,315  
LTIP Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 241,691 241,691 241,691
LTIP Units | October 1, 2017 - December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 70,837 70,837  
LTIP Units | 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 70,842 70,842  
LTIP Units | 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 70,838 70,838  
LTIP Units | 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 29,174 29,174  
LTIP Units | 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 0 0  
Performance Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 514,998 514,998 514,998
Performance period 3 years    
Performance Units | October 1, 2017 - December 31, 2017      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 0 0  
Performance Units | 2018      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 315,998 315,998  
Performance Units | 2019      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 199,000 199,000  
Performance Units | 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 0 0  
Performance Units | 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested shares 0 0