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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, 2016
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding, Number of Stock Options, Beginning Balance | shares 1,288
Granted, Number of Stock Options Outstanding | shares 122
Exercised, Number of Stock Options Outstanding | shares (483)
Forfeited or expired, Number of Stock Options Outstanding | shares (51)
Outstanding, Number of Stock Options, Ending Balance | shares 876
Vested or expected to vest, Number of Stock Options Outstanding | shares 834
Exercisable, Number of Stock Options Outstanding | shares 568
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 11.00
Granted, Weighted Average Exercise Price | $ / shares 16.71
Exercised, Weighted Average Exercise Price | $ / shares 10.65
Forfeited or expired, Weighted Average Exercise Price | $ / shares 12.99
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares 11.88
Vested or expected to vest, Weighted Average Exercise Price | $ / shares 11.70
Exercisable, Weighted Average Exercise Price | $ / shares $ 9.95
Outstanding, Weighted Average Remaining Contractual Term 5 years 22 days
Vested or expected to vest, Weighted Average Remaining Contractual Term 4 years 10 months 24 days
Exercisable, Weighted Average Remaining Contractual Term 3 years 5 months 9 days
Outstanding, Aggregate Intrinsic Value | $ $ 9,684
Vested or expected to vest, Aggregate Intrinsic Value | $ 9,369
Exercisable, Aggregate Intrinsic Value | $ $ 7,370