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Stock-based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended
Apr. 30, 2013
Sep. 30, 2013
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Treasury stock acquisition price   $ 85,733
Employee Stock Option
    
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Treasury stock shares acquired   637,624
Acquired to satisfy the exercise price | Employee Stock Option
    
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Treasury stock acquisition price   12,300
Acquired to satisfy payroll tax withholding obligations | Employee Stock Option
    
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Treasury stock acquisition price   $ 2,900
Performance Unit Awards 2010
    
Compensation Related Costs Share Based Payments Disclosure [Line Items]    
Performance period   3 years
Award description   Generally, the recipients will receive a target number of shares if the Company's total shareholder return is positive and, when compared to the peer group, is at the 50thpercentile and two times the target if at the 75th percentile or higher.
Target number of shares   178,750
Shares issued 357,500