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Stock Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Amortization related to restricted stock awards and LTIP Unit Awards $ 1,506 $ 3,322 $ 4,067 $ 4,897
Unrecognized compensation related to unvested restricted stock and unit awards $ 8,558   $ 8,558  
Weighted average period of unrecognized compensation expected to be recognized     1 year 5 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