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Share-based Compensation - Summary of Additional Restricted Stock Information (Detail) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ 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]      
Weighted-average grant date fair value per share $ 16.37 $ 15.36 $ 16.23
Fair value of restricted stock awards that vested $ 347 $ 2,198 $ 224