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Stock-Based Compensation - Information about Options Exercised (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award Options Activity [Abstract]      
Options exercised 60,000 120,000 50,000
Total intrinsic value of exercised options $ 1,376 $ 4,551 $ 1,970
Fair value of vested stock options     17
Tax benefits realized $ 501 $ 1,697 $ 603