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Share-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]        
Share-based compensation $ 11,300 $ 5,400 $ 31,468 $ 23,019
2015 Performance Share Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non vested share-based compensation arrangements 13,030   13,030  
2015 Market-Based Share Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non vested share-based compensation arrangements 2,000   $ 2,000  
Unvested Restricted Awards | Maximum | Certain key Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Performance Shares | 2015 Performance Share Plan | attained in 2017        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of performance shares grant expected to vest     200.00%  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to non vested share-based compensation arrangements $ 4,100   $ 4,100  
Unrecognized compensation cost related to non vested share-based compensation arrangements, remaining weighted average recognition period     1 year 6 months  
Stock Options | Maximum | Certain key Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years