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Share-Based Employee Compensation - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
USD ($)
plan
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of plans | plan 2      
Authorized (in shares) | shares 34,000,000      
Compensation expense related to stock options $ 14,000 $ 34,000 $ 146,000  
Share based compensation, weighted average estimated forfeiture rate 1.70% 1.70% 3.70%  
Number of shares granted (in shares) | shares 0 0 0  
Total intrinsic value for options exercised $ 2,621,000 $ 3,546,000 $ 1,005,000  
Exercise of stock options 1,636,000 5,362,000 2,637,000  
Compensation expense related to restricted stock 5,949,000 5,537,000 4,283,000  
Stock compensation - expensed (reversed) 13,530,000 12,615,000 $ 9,285,000  
Accrued employee compensation and benefits $ 43,172,000 $ 40,173,000    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accrued incremental dividend equivalent rights (in shares) | shares 6,000      
Total unrecognized compensation expense related to non-vested shares granted $ 8,918,000      
Unrecognized compensation expense expected recognition period 2 years 2 months 1 day      
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) | $ / shares $ 15.30 $ 10.94 $ 9.36  
Number of units granted (in units) | shares 424,000      
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 $ 0      
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 $ 10,066,000      
Unrecognized compensation expense expected recognition period 1 year 1 month 17 days      
Weighted average grant date fair value per share of PSUs granted (in dollars per unit) | $ / shares $ 14.80 $ 10.68 $ 8.61  
Award requisite service period 3 years   1 year  
Shares awarded as a percentage of granted       130.20%
Number of units granted (in units) | shares 307,000 462,000 420,000  
Stock compensation - expensed (reversed) $ 7,567,000 $ 7,075,000 $ 4,536,000  
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Stock compensation - expensed (reversed)   $ (32,000) $ 320,000  
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 33,000,000      
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