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Stock-Based Compensation (Detail) - (Table 3) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Proceeds from stock options exercised $ 1,162 $ 1,451 $ 4,869 $ 21,154
Intrinsic value of stock options exercised $ 634 $ 4,340 $ 11,684 $ 33,634