Stockholders' Equity - Additional Information (Detail)	1 Months Ended	3 Months Ended	12 Months Ended			48 Months Ended
	May. 31, 2014 USD ($) $ / shares shares	Jun. 30, 2013 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) Number_of_stock_repurchase $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2011 shares	May. 23, 2013 shares	Feb. 28, 2013 USD ($)	Dec. 31, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of repurchase programs authorized | Number_of_stock_repurchase			2
Common stock, par value (in dollars per share) | $ / shares			$ 0.00001	$ 0.00001
Common stock, shares authorized			200,000,000	200,000,000
Preferred stock, shares authorized			25,000,000	25,000,000
Outstanding common stock repurchase program authorized amount | $	$ 30,000,000.0							$ 25,000,000
Shares repurchased	2,000,000	3,000,000
Additional stock repurchase program authorized amount | $	$ 30,000,000	$ 25,000,000	$ 7,556,000	$ 22,442,000	$ 25,000,000
Remaining authorized repurchase amount | $			0
Tax payments, for net share settlement of share based award | $			1,370,000	1,347,000	309,000
Excess tax benefit from stock-based compensation | $			6,936,000	7,985,000	$ 6,797,000
Share based compensation arrangement by share based payment award future tax benefit | $			$ 3,400,000	$ 3,100,000
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future grants							1,600,000
Shares available for future grants			1,300,000
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)			49,000	140,000	270,000
Performance criteria met for approximate units (in shares)			0
Approximate units outstanding (in shares)			100,000
Incremental stock option expense | $			$ 1,500,000	$ 1,000,000	$ 1,400,000
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			$ 17.29
Aggregate intrinsic value, RSUs vested | $			$ 12,200,000
Shares withheld, for net share settlement of share based award			54,182
Tax payments, for net share settlement of share based award | $			$ 1,400,000
Performance criteria met for approximate units (in shares)			487,951	432,706	257,693
Approximate units outstanding (in shares)			1,139,277	1,226,088	1,279,123				582,212
Unrecognized stock-based compensation expense related to non-vested stock options | $			$ 16,800,000
Weighted average period			2 years 7 months 24 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised | $			$ 13,600,000	$ 20,200,000	$ 15,700,000
Aggregate intrinsic value, option outstanding | $			13,100,000
Aggregate intrinsic value, options exercisable | $			$ 12,800,000
Number of options outstanding (in shares)			1,102,745	1,641,083	3,365,692				6,321,076
Weighted average exercise price (in dollars per share) | $ / shares			$ 5.37	$ 5.26	$ 6.15				$ 6.05
New option granted (in shares)			0	0	0
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)			30,600
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			3 years
Aggregate intrinsic value of unvested options | $			$ 400,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock option expense | $			$ 100,000	$ 0	$ 100,000
Number of options outstanding (in shares)			200,000
New option granted (in shares)						1,000,000
Unvested performance options (in shares)			30,600
Unvested share, expected to vest (in share)			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 | $			$ 600,000
Incentive Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incremental stock option expense | $			100,000	28,000	100,000
Non Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit recorded | $			$ 200,000	$ 700,000	$ 600,000
Repurchase of Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average cost of repurchase (in dollars per share) | $ / shares	$ 14.85	$ 8.20