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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, 2015
USD ($)
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Outstanding, Number of Stock Options, Beginning Balance | shares 1,688
Granted, Number of Stock Options Outstanding | shares 83
Exercised, Number of Stock Options Outstanding | shares (449)
Forfeited or expired, Number of Stock Options Outstanding | shares (34)
Outstanding, Number of Stock Options, Ending Balance | shares 1,288
Vested or expected to vest, Number of Stock Options Outstanding | shares 1,251
Exercisable, Number of Stock Options Outstanding | shares 984
Outstanding, Weighted Average Exercise Price, Beginning Balance | $ / shares $ 10.92
Granted, Weighted Average Exercise Price | $ / shares 16.00
Exercised, Weighted Average Exercise Price | $ / shares 11.45
Forfeited or expired, Weighted Average Exercise Price | $ / shares 13.11
Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares 11.00
Vested or expected to vest, Weighted Average Exercise Price | $ / shares 10.93
Exercisable, Weighted Average Exercise Price | $ / shares $ 10.04
Outstanding, Weighted Average Remaining Contractual Term 4 years 7 months 17 days
Vested or expected to vest, Weighted Average Remaining Contractual Term 4 years 6 months 18 days
Exercisable, Weighted Average Remaining Contractual Term 3 years 7 months 21 days
Outstanding, Aggregate Intrinsic Value | $ $ 7,629
Vested or expected to vest, Aggregate Intrinsic Value | $ 7,502
Exercisable, Aggregate Intrinsic Value | $ $ 6,774