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Share-based Compensation - Summary of Additional Restricted Stock Information (Detail) - Restricted Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value per share $ 15.89 $ 16.30 $ 16.37 $ 15.29
Fair value of restricted stock awards that vested $ 347 $ 698 $ 347 $ 2,198