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Shared-Based Compensation - Reconciliation of Option Activity (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Number of options, Outstanding, Beginning Balance | shares 746,000
Number of Options, Granted | shares 55,300
Number of Options, Exercised | shares (23,000)
Number of Options, Outstanding, Ending Balance | shares 778,000
Number of Options, Options Exercisable | shares 619,000
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares $ 14.33
Weighted-Average Exercise Price, Granted | $ / shares 24.55
Weighted-Average Exercise Price, Exercised | $ / shares 10.00
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares 15.19
Weighted-Average Exercise Price, Options exercisable | $ / shares $ 13.44
Weighted-Average Remaining Contractual Term, Outstanding 6 years 4 months 24 days
Weighted- Average Remaining Contractual Term, Options exercisable 5 years 8 months 12 days
Aggregate Intrinsic Value, Exercised | $ $ 238
Aggregate Intrinsic Value, Outstanding | $ 6,850
Aggregate Intrinsic Value, Options exercisable | $ $ 6,539