Stockholders' Equity - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	May 31, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 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			$ 1,299,000	$ 848,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense related to non-vested stock options		$ 18,000,000	$ 18,000,000
Weighted average period over which costs are recognized			2 years 6 months 7 days
Units meeting performance criteria (in shares)			321,000
Approximate units outstanding (in shares)		1,213,000	1,213,000			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
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			67,400
Tax payments, for net share settlement of share based award			$ 1,300,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value price per share (in dollars per share)		$ 28.61	$ 28.61
Total intrinsic value of options exercised			$ 1,800,000	$ 13,300,000
Number of options outstanding (in shares)		1,015,000	1,015,000			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		0	1,800,000	300,000
Cost of shares repurchased			$ 33,800,000	$ 7,600,000
Average cost of shares repurchased (in dollars per share)			$ 18.90	$ 25.86
Average price of shares repurchased (in dollars per share)			$ 18.87
Remaining authorized repurchase amount		$ 16,200,000	$ 16,200,000