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Stock-Based Compensation Plans - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Stock_Plan
Executives
Directors
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option compensation $ 3,700,000 $ 2,600,000 $ 2,500,000
Accrued liabilities 84,100,000 77,200,000  
Maximum cash bonus under long-term incentive plan $ 3,000,000    
Stock Options Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of active stock option plans | Stock_Plan 5    
Number of active stock option plans for employees | Stock_Plan 2    
Number of active stock option plans for non-employee directors | Directors 1    
Number of active stock option plans for key executives | Executives 1    
Expiration term for stock granted 10 years    
Aggregate number of shares of common stock reserved for issuance which can be granted | shares 2,640,000    
Number exercisable and fully vested | shares 89,949    
Fully vested stock options with performance conditions attached | shares 18,318    
Stock option compensation $ 3,700,000 2,600,000 2,500,000
Total intrinsic value exercised 2,400,000 900,000 4,700,000
Total compensation cost related to non-vested stock options not yet recognized $ 4,800,000    
Expected compensation cost recognized over the weighted-average period 2 years 2 months 27 days    
Cash tax benefit realized from stock option exercises $ 1,300,000 900,000 5,700,000
Excess tax benefit $ 500,000 400,000 3,800,000
Stock Options Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of stock vesting period 24 months    
Stock Options Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of stock vesting period 6 years    
Stock Equivalent Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration term for stock granted 10 years    
Fully vested stock options with performance conditions attached | shares 46,951    
Total intrinsic value exercised $ 2,400,000 3,700,000 2,200,000
Expected compensation cost recognized over the weighted-average period 1 year 6 months    
Accrued liabilities $ 7,800,000    
Number of exercisable SEUs | shares 56,435    
Compensation cost $ 4,900,000 $ 2,000,000 $ 7,100,000
Stock Equivalent Units [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of stock vesting period 11 months    
Stock Equivalent Units [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Range of stock vesting period 4 years