Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended			3 Months Ended	12 Months Ended							12 Months Ended						12 Months Ended												3 Months Ended	12 Months Ended
	Apr. 25, 2012	Feb. 28, 2013	Jul. 31, 2011	Mar. 31, 2011	Jun. 30, 2013	Dec. 31, 2013 Number_of_stock_repurchase	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2013 Performance Based Restricted Stock Unit [Member]	Dec. 31, 2012 Performance Based Restricted Stock Unit [Member]	Dec. 31, 2013 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2011 Stock Options [Member]	Dec. 31, 2010 Stock Options [Member]	Dec. 31, 2013 Non-Vested Options [Member]	Dec. 31, 2013 Performance Shares [Member]	Dec. 31, 2012 Performance Shares [Member]	Dec. 31, 2011 Performance Shares [Member]	Dec. 31, 2013 Non Qualified Stock Options [Member]	Dec. 31, 2012 Non Qualified Stock Options [Member]	Dec. 31, 2011 Non Qualified Stock Options [Member]	Dec. 31, 2013 Incentive Stock Options [Member]	Dec. 31, 2012 Incentive Stock Options [Member]	Dec. 31, 2011 Incentive Stock Options [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Service Based Restricted Stock Unit [Member]	Jun. 30, 2013 Repurchase of Equity [Member]	Dec. 31, 2013 Minimum [Member] Performance Based Restricted Stock Unit [Member]	Dec. 31, 2013 Minimum [Member] Service Based Restricted Stock Unit [Member]	Dec. 31, 2013 Maximum [Member] Performance Based Restricted Stock Unit [Member]	Dec. 31, 2013 Maximum [Member] Service Based Restricted Stock Unit [Member]	Dec. 31, 2013 2013 Stock Incentive Plan [Member]	May 23, 2013 2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Repurchase Programs authorized						2
Common stock, par value						$ 0.00001	$ 0.00001
Preferred stock, par value						$ 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	$ 20,000,000	$ 25,000,000	$ 20,000,000	$ 12,500,000
Shares repurchased					3,000,000
Additional stock repurchase program authorized amount					25,000,000	25,000,000	19,996,000	32,499,000
Average cost of repurchase per share	$ 5.22							$ 4.35																							$ 8.20
Shares repurchased by company	3,800,000							7,500,000
Vesting period																																1 year	3 years	4 years	4 years
Contractual maturity of plan													10 years																	10 years
Option available for future grants																																				2,300,000
Shares reserved for future grants																																					1,600,000
Aggregate intrinsic value price per share									$ 15.88
Approximate units of performance restricted stock granted													300,000	200,000
Performance criteria met for approximate units									257,693	97,007			200,000
Approximate units outstanding									1,279,123	582,212	1,096	50	300,000
Incremental stock option expense													1,400,000	700,000						100,000	100,000	300,000				100,000	500,000	1,300,000
Shares withheld, for net share settlement of share based award																													33,000
Tax payments, for net share settlement of share based award						309,000																							300,000
Weighted average fair value of options granted								$ 2.16
Total intrinsic value of options exercised						15,700,000	3,200,000	1,600,000
New option granted						0	0										1,018,182					1,000,000
Aggregate intrinsic value, option outstanding															33,100,000
Aggregate intrinsic value, options exercisable															31,400,000
Aggregate intrinsic value price per share															$ 15.88
Number of Options Outstanding															3,365,692	6,321,076	7,576,493	7,507,236	100,000	400,000
Options outstanding, weighted average exercise price															$ 6.15	$ 6.05	$ 5.75	$ 5.71	$ 4.58
Weighted average fair value																			$ 2.18
Weighted average remaining contractual life																			6 years 9 months 18 days
Aggregate intrinsic value of unvested options																			1,700,000
Unvested performance options																				50,000
Unvested share, expected to vest																				17,000
Options expected to vest, end of year															103,362					400,000
Fair value of performance-based stock options outstanding and expected to vest																				1,000,000
Tax benefit recorded																							6,800,000	4,700,000	10,000
Share based compensation arrangement by share based payment award future tax benefit						3,500,000	3,700,000
Weighted average period									31 months						12 months
Unrecognized stock-based compensation expense related to non-vested stock options									$ 8,600,000						$ 100,000