Stockholders' Equity - Additional Information (Detail)	12 Months Ended			48 Months Ended
	Dec. 31, 2017 USD ($) class_of_stock $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2011 shares	Dec. 29, 2017 $ / shares	Feb. 29, 2016 USD ($)	Feb. 26, 2016 shares	Dec. 31, 2014 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of classes of stock | class_of_stock	2
Common stock, par value (in dollars per share) | $ / shares	$ 0.00001	$ 0.00001
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Outstanding common stock repurchase program authorized amount | $						$ 50,000,000.0
Shares repurchased (in shares)		1,800,000
Purchase of treasury stock | $		$ 33,746,000	$ 7,556,000
Average cost of repurchase (in dollars per share) | $ / shares		$ 18.90
Remaining authorized repurchase amount | $	$ 16,300,000	$ 16,200,000
Tax payments, for net share settlement of share based award | $	$ 3,453,000	$ 1,772,000	$ 1,370,000
New option granted (in shares)	0	0	0
Service Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual maturity of plan	10 years
Service Based Restricted Stock Unit | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Service Based Restricted Stock Unit | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual maturity of plan	10 years
Approximate units of performance restricted stock granted (in shares)	353,000	79,000	49,000
Performance criteria met for approximate units (in shares)	36,000
Approximate units outstanding (in shares)	400,000
Incremental stock option expense | $	$ 2,500,000	$ 2,100,000	$ 1,500,000
Performance Based Restricted Stock Unit | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Percentage of targeted shares earned that can vest	0.00%
Performance Based Restricted Stock Unit | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
Percentage of targeted shares earned that can vest	200.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock price on the last trading day of the period (in dollars per share) | $ / shares					$ 26.50
Aggregate intrinsic value, RSUs vested | $	$ 14,500,000
Shares withheld, for net share settlement of share based award (in shares)	137,726
Tax payments, for net share settlement of share based award | $	$ 3,500,000
Performance criteria met for approximate units (in shares)	519,000	414,000	488,000
Approximate units outstanding (in shares)	2,348,000	1,330,000	1,139,000					1,226,000
Unrecognized stock-based compensation expense related to non-vested stock options | $	$ 42,800,000
Weighted average period	2 years 9 months 18 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised | $	$ 3,200,000	$ 2,000,000	$ 13,600,000
Aggregate intrinsic value, option outstanding | $	17,300,000
Aggregate intrinsic value, options exercisable | $	$ 16,700,000
Number of options outstanding (in shares)	804,000	1,008,000	1,103,000					1,641,000
Weighted average exercise price (in dollars per share) | $ / shares	$ 4.99	$ 5.40	$ 5.37					$ 5.26
Options expected to vest, end of year (in shares)	25,000
Non-Vested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)	29,350
Weighted average exercise price (in dollars per share) | $ / shares	$ 4.75
Weighted average fair value (in dollars per share) | $ / shares	$ 2.58
Weighted average remaining contractual life	1 year
Aggregate intrinsic value of unvested options | $	$ 600,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock option expense | $	$ 0	$ 0	$ 100,000
New option granted (in shares)				1,000,000
Number of options outstanding (in shares)	200,000
Unvested performance options (in shares)	29,350
Unvested share, expected to vest (in shares)	25,000
Options expected to vest, end of year (in shares)	200,000
Fair value of performance-based stock options outstanding and expected to vest | $	$ 500,000
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock option expense | $	0	0	54,000
Non Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit recorded | $	$ 100,000	$ 200,000	$ 200,000
2016 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future grants (in shares)							2,000,000
Shares available for future grants (in shares)	800,000