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Share-Based Compensation Summary of Information Regarding Stock Option and Restricted Stock Activity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of stock options exercised $ 27,430 $ 21,288 $ 25,520
Total grant date fair value of stock options vested 21,052 20,291 18,168
Restricted stock unit      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of restricted stock vested 34,009 25,453 14,176
Total grant date fair value of restricted stock vested $ 19,428 $ 14,935 $ 10,940