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Shared-Based Compensation - Reconciliation of Option Activity (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of options, Outstanding, Beginning Balance | shares 897
Number of Options, Granted | shares 126
Number of Options, Exercised | shares (250)
Number of Options, Forfeited or expired | shares (6)
Number of Options, Outstanding, Ending Balance | shares 767
Number of Options, Options Exercisable | shares 583
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 12.22
Weighted-Average Exercise Price, Granted | $ / shares 24.20
Weighted-Average Exercise Price, Exercised | $ / shares 11.79
Weighted-Average Exercise Price, Forfeited or expired | $ / shares 7.72
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares 14.32
Weighted-Average Exercise Price, Options exercisable | $ / shares $ 12.71
Weighted-Average Remaining Contractual Term, Outstanding 6 years 6 months
Weighted- Average Remaining Contractual Term, Options exercisable 5 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $ $ 11,246
Aggregate Intrinsic Value, Options exercisable | $ $ 9,500