Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	May 31, 2016	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Feb. 29, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option available for future grants (in shares)		2,900,000	2,900,000
Tax payments, for net share settlement of share based award			$ 1,036,000	$ 647,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to non-vested stock options		$ 18,700,000	$ 18,700,000
Weighted average period over which costs are recognized			2 years 6 months 15 days
Units meeting performance criteria (in shares)			281,000
Approximate units outstanding (in shares)		1,223,000	1,223,000			1,139,000
Performance Based Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Approximate units of performance restricted stock granted (in shares)			100,000
Units meeting performance criteria (in shares)			2,000
Approximate units outstanding (in shares)		200,000	200,000
Maximum additional shares to be issued		200,000	200,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld, for net share settlement of share based award			58,300
Tax payments, for net share settlement of share based award			$ 1,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value price per share (in dollars per share)		$ 24.88	$ 24.88
Total intrinsic value of options exercised			$ 800,000	13,200,000
Number of options outstanding (in shares)		1,058,000	1,058,000			1,103,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding (in shares)		200,000	200,000
Unvested performance options (in shares)		30,600	30,600
Unvested shares, expected to vest		25,000	25,000
2013 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized	2,000,000
2014 Stock Repurchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding common stock repurchase program authorized amount (up to)					$ 50,000,000.0
Shares repurchased during period		1,300,000	1,800,000
Cost of shares repurchased		$ 24,800,000	$ 33,800,000	$ 0
Average cost of shares repurchased (in dollars per share)		$ 18.92	$ 18.90
Average price of shares repurchased (in dollars per share)		$ 18.89	$ 18.87
Remaining authorized repurchase amount		$ 16,200,000	$ 16,200,000