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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amortization related to restricted stock awards and LTIP unit awards $ 1,507 $ 1,351 $ 5,574 $ 6,248
Unrecognized compensation related to unvested restricted stock and unit awards $ 7,047   $ 7,047  
Weighted average period of unrecognized compensation expected to be recognized     343 days  
Long-Term Incentive Program | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     0.00%  
Long-Term Incentive Program | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage     100.00%  
Management | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock and unit awards to employees     216,975  
Fair value of restricted stock and unit awards     $ 4,708  
Vesting period of restricted stock     3 years  
Compensation expense recognized at date of grant     $ 1,250 $ 1,451
Management | Long-Term Incentive Program        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock and unit awards to employees     264,432  
Fair value of restricted stock and unit awards     $ 2,531  
Director | Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock and unit awards to employees     17,385  
Fair value of restricted stock and unit awards     $ 350  
Vesting period of restricted stock     1 year