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Share-Based Employee Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of plans | plan 2    
Compensation expense related to stock options $ 1,396 $ 1,907 $ 1,839
Share based compensation, weighted average estimated forfeiture rate 6.20% 6.50% 6.60%
Weighted-average grant-date fair value of options granted | $ / shares     $ 2.47
Number of Shares, Granted | shares 0 0  
Total intrinsic value for options exercised $ 2,151 $ 569 $ 243
Exercise of stock options 6,565 2,291 1,652
Compensation expense related to restricted stock 3,539 2,530 1,694
Stock compensation - expensed (reversed) (11,220) (5,327) $ (8,184)
Accrued employee compensation and benefits $ 33,518 $ 37,386  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Expiration period 10 years    
Total unrecognized compensation expense related to non-vested shares granted $ 187    
Unrecognized compensation expense expected recognition period 2 months 26 days    
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Granted, number of units | shares 564,000    
Total unrecognized compensation expense related to non-vested shares granted $ 4,563    
Unrecognized compensation expense expected recognition period 1 year 2 months 26 days    
Weighted average grant date fair value per share of PSUs granted | $ / shares $ 8.33 $ 8.21 $ 6.55
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Granted, number of units | shares 510,000 453,000  
Total unrecognized compensation expense related to non-vested shares granted $ 5,509    
Unrecognized compensation expense expected recognition period 1 year 7 months 24 days    
Shares awarded as a percentage of granted 130.00% 131.50%  
Weighted average grant date fair value per share of PSUs granted | $ / shares $ 7.96 $ 8.20  
Stock compensation - expensed (reversed) $ (2,607)    
Performance shares | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awarded as a percentage of granted 150.00%    
Performance shares | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares awarded as a percentage of granted 50.00%    
Phantom Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted, number of units | shares 0 0  
Weighted average grant date fair value per share of PSUs granted | $ / shares $ 0.00    
Stock compensation - expensed (reversed) $ (390) $ (649) $ (1,635)
Accrued employee compensation and benefits   1,898  
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Granted, number of units | shares 0    
Weighted average grant date fair value per share of PSUs granted | $ / shares $ 0.00    
Stock compensation - expensed (reversed) $ (3,288) (1,062) $ (3,016)
Accrued employee compensation and benefits $ 1,460 $ 3,990  
2004 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement, maximum number of shares that can be granted to a participant in any fiscal year | shares 2,000,000    
2004 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement, maximum number of shares issuable | shares 24,000,000    
2013 Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation arrangement, maximum number of shares that can be granted to a participant in any fiscal year | shares 50,000    
2013 Directors Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share based compensation arrangement, maximum number of shares issuable | shares 1,000,000