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Share-Based Employee Compensation - Additional Information (Detail)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of plans | plan 2    
Authorized (in shares) | shares 25,000,000    
Compensation expense related to stock options $ 146 $ 1,396 $ 1,907
Share based compensation, weighted average estimated forfeiture rate 3.70% 6.20% 6.50%
Number of shares granted (in shares) | shares 0 0 0
Total intrinsic value for options exercised $ 1,005 $ 2,151 $ 569
Exercise of stock options 2,637 6,565 2,291
Compensation expense related to restricted stock 4,283 3,539 2,530
Stock compensation - expensed (reversed) 9,285 11,220 $ 5,327
Accrued employee compensation and benefits $ 32,568 $ 33,518  
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accrued incremental dividend equivalent rights (in shares) | shares 10,000    
Total unrecognized compensation expense related to non-vested shares granted $ 6,831    
Unrecognized compensation expense expected recognition period 1 year 10 months 20 days    
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) | $ / shares $ 9.36 $ 8.33 $ 8.21
Number of units granted (in units) | shares 707,000    
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 $ 48    
Unrecognized compensation expense expected recognition period 1 year 5 months 1 day    
Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Total unrecognized compensation expense related to non-vested shares granted $ 5,465    
Unrecognized compensation expense expected recognition period 1 year 1 month 13 days    
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) | $ / shares $ 8.61 $ 7.96 $ 8.20
Award requisite service period 3 years 1 year 1 year
Shares awarded as a percentage of granted   130.20% 131.50%
Number of units granted (in units) | shares 420,000 510,000 453,000
Stock compensation - expensed (reversed) $ 4,536 $ 2,607 $ 1,302
Phantom Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of units granted (in units) | shares 0 0 0
Stock compensation - expensed (reversed)   $ 390 $ 649
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) | $ / shares $ 0.00    
Number of units granted (in units) | shares 0    
Stock compensation - expensed (reversed) $ 320 3,288 $ (1,062)
Accrued employee compensation and benefits $ 224 $ 1,460  
Minimum | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Minimum | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 1 year    
Shares awarded as a percentage of granted 0.00%    
Maximum | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Maximum | Performance shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service period 3 years    
Shares awarded as a percentage of granted 200.00%    
2004 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares per employee | shares 2,000,000    
2004 Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized (in shares) | shares 24,000,000    
2013 Directors Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares per employee | shares 50,000    
2013 Directors Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized (in shares) | shares 1,000,000