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Stock Incentive Plans - Schedule of Certain Information Related to Restricted Stock Awards (Detail) - Restricted Stock [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 7,066 $ 4,461 $ 3,584
Tax benefit associated with compensation expense 2,473 1,561 1,254
Fair value of awards vested $ 4,587 $ 6,070 $ 10,713