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Share-based Compensation - Summary of Company's Stock Option Plan Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of Shares, Options outstanding, Beginning balance 1,044
Number of Shares, Granted 329
Number of Shares, Exercised (203)
Number of Shares, Forfeited (4)
Number of Shares, Expired 0
Number of Shares, Options outstanding, Ending balance 1,166
Number of Shares, Options exercisable 683
Number of Shares, Available for grant 161
Weighted Average Exercise Price Per Share, Options outstanding, Beginning balance | $ / shares $ 13.36
Weighted Average Exercise Price Per Share, Granted | $ / shares 17.49
Weighted Average Exercise Price Per Share, Exercised | $ / shares 12.52
Weighted Average Exercise Price Per Share, Forfeited | $ / shares 15.66
Weighted Average Exercise Price Per Share, Expired | $ / shares 0
Weighted Average Exercise Price Per Share, Options outstanding, Ending balance | $ / shares 14.66
Weighted Average Exercise Price Per Share, Options exercisable | $ / shares $ 13.09
Weighted Average Remaining Contractual Life (Years), Options outstanding 6 years 3 months 18 days
Weighted Average Remaining Contractual Life (Years), Options exercisable 4 years 10 months 24 days
Aggregate Intrinsic Value, Options outstanding | $ $ 13,754
Aggregate Intrinsic Value, Options exercisable | $ $ 9,127