Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended				3 Months Ended		3 Months Ended
	May 23, 2013	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Restricted Stock [Member]	Dec. 31, 2013 Restricted Stock [Member]	Mar. 31, 2014 Stock Options [Member]	Mar. 31, 2013 Stock Options [Member]	Mar. 31, 2014 Performance Based Stock Options [Member]	Mar. 31, 2014 Performance Based Restricted Stock Unit [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Incentive Stock Options [Member]	Mar. 31, 2013 Incentive Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock incentive plan	1,600,000
Option available for future grants		2,000,000
Aggregate intrinsic value price per share				$ 18.29		$ 18.29
Unrecognized stock-based compensation cost				$ 12,900,000		$ 100,000
Weighted average period				31 months 15 days
Approximate units of performance restricted stock granted									100,000
Approximate units outstanding				1,244,806	1,279,123				300,000
Performance criteria met for approximate units				302,194					100,000
Maximum additional shares									100,000
Shares withheld, for net share settlement of share based award										100,000
Tax payments, for net share settlement of share based award		1,138,000	178,000							1,100,000
Aggregate intrinsic value, options exercisable						27,697,000	1,600,000
Weighted average vesting period		10 months
Performance-based stock options Cumulative Granted								400,000
Unvested performance options								40,000
Number of options awarded		0	0
Incremental stock option expense											$ 8,000	$ 39,000