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Stockholders' Equity and Stock-Based Compensation Plans - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Stock Options Plan [Member]
Executives
Stock_Plan
Directors
Jun. 30, 2012
Stock Options Plan [Member]
Jun. 30, 2013
Stock Options Plan [Member]
Minimum [Member]
Jun. 30, 2013
Stock Options Plan [Member]
Maximum [Member]
Jun. 30, 2013
Phantom Share Units PSUs [Member]
Jun. 30, 2012
Phantom Share Units PSUs [Member]
Jun. 30, 2013
Phantom Share Units PSUs [Member]
Minimum [Member]
Jun. 30, 2013
Phantom Share Units PSUs [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 6,005,647 6,222,076                
Number of active stock option plans     5              
Number of active stock option plans for employees     2              
Number of active stock option plans for non-employee directors     1              
Number of active stock option plans for key executives     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 exercisable and fully vested     149,229              
Fully vested stock options with performance conditions attached     66,266       69,097      
Total compensation cost of SEUs     $ 1.4 $ 1.6     $ 3.9 $ 2.8    
Total intrinsic value of options exercised     2.4 0.6     1.8 1.1    
Total compensation cost related to non-vested stock options not yet recognized     $ 2.7              
Expected compensation cost recognized over the weighted average period     1 year 11 months 23 days       1 year 2 months 9 days      
Number of exercisable SEUs             75,439