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Stockholders' Equity and Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended 9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Stock Options Plan [Member]
Stock_Plan
Directors
Sep. 30, 2013
Stock Options Plan [Member]
Sep. 30, 2014
Stock Options Plan [Member]
Minimum [Member]
Sep. 30, 2014
Stock Options Plan [Member]
Maximum [Member]
Sep. 30, 2014
Stock Equivalent Units [Member]
Sep. 30, 2013
Stock Equivalent Units [Member]
Sep. 30, 2014
Stock Equivalent Units [Member]
Minimum [Member]
Sep. 30, 2014
Stock Equivalent Units [Member]
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares authorized 40,000,000 40,000,000                
Number of shares issued 29,554,500 29,554,500                
Treasury stock, shares 5,126,216 5,207,947                
Number of active stock option plans     4              
Number of active stock option plans for employees     2              
Number of active stock option plans for non-employee directors     1              
Range of stock vesting period         24 months 6 years     11 months 4 years
Expiration term for stock granted     10 years       10 years      
Aggregate number of shares of common stock reserved for issuance which can be granted     2,640,000              
Number of stock options exercisable and fully vested     135,621              
Fully vested stock options with performance conditions attached     51,001       84,267      
Stock option compensation cost of SEUs     $ 1.7 $ 1.9     $ 0.3 $ 6.3    
Total intrinsic value of options exercised     0.9 3.2     3.5 2.1    
Total compensation cost related to non-vested stock options not yet recognized     5.3              
Expected compensation cost recognized over the weighted-average period     2 years 5 months 16 days       1 year 7 months 17 days      
Number of exercisable SEUs             95,526      
Maximum cash bonus under long-term incentive plan $ 3