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Stock Compensation Plans - Stock-Based Compensation Expense Included in Consolidated Statement of Income and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation $ 27,778 $ 23,010 $ 23,591
Less tax benefit (8,456) (7,228) (7,730)
Total stock-based compensation, net of tax 19,322 15,782 15,861
Equity-based awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation 23,736 19,716 20,547
Liability-based awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation $ 4,042 $ 3,294 $ 3,044