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Stock Option Plans and Restricted Stock Awards - Option Activity under Company's Stock Option Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding, Number of Stock Options, Beginning Balance | shares 876
Granted, Number of Stock Options Outstanding | shares 12
Exercised, Number of Stock Options Outstanding | shares (283)
Forfeited or expired, Number of Stock Options Outstanding | shares (17)
Outstanding, Number of Stock Options, Ending Balance | shares 588
Vested or expected to vest, Number of Stock Options Outstanding | shares 560
Exercisable, Number of Stock Options Outstanding | shares 383
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 11.88
Granted, Weighted Average Exercise Price | $ / shares 21.99
Exercised, Weighted Average Exercise Price | $ / shares 9.48
Forfeited or expired, Weighted Average Exercise Price | $ / shares 15.69
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares 13.12
Vested or expected to vest, Weighted Average Exercise Price | $ / shares 12.96
Exercisable, Weighted Average Exercise Price | $ / shares $ 11.46
Outstanding, Weighted Average Remaining Contractual Term 5 years 2 months 1 day
Vested or expected to vest, Weighted Average Remaining Contractual Term 5 years 11 days
Exercisable, Weighted Average Remaining Contractual Term 3 years 10 months 25 days
Outstanding, Aggregate Intrinsic Value | $ $ 6,137
Vested or expected to vest, Aggregate Intrinsic Value | $ 5,942
Exercisable, Aggregate Intrinsic Value | $ $ 4,640