Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	12 Months Ended					1 Months Ended
	May 27, 2014	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Jan. 31, 2012	May 20, 2014	Apr. 01, 2014
Shareholders Equity [Line Items]
Preferred stock, shares authorized			1,000,000		1,000,000
Common stock, shares authorized			200,000,000		100,000,000				200,000,000
Common stock, par value			$ 0.01		$ 0.01					$ 0.01
Common stock, shares issued			76,357,000		76,324,000
Common stock, shares outstanding			76,357,000	[1]	76,324,000	[1]
Aggregate amount of stock repurchases authorized			$ 119,000,000
Cash dividends declared, per share	$ 0.030		$ 0.105		$ 0.060		$ 0.060
Dividend payments to shareholders		0	6,874,000		3,421,000		5,680,000
Post-Split Basis
Shareholders Equity [Line Items]
Exercise of warrants								4,928
Common stock shares with held in connection with exercise of warrants			156
Value of common stock shares with held			$ 2,094
Number of common stock issued in connection with exercise of warrants			4,772
Post-Split Basis
Shareholders Equity [Line Items]
Cash dividends declared, per share	$ 0.015

[1] The number of common shares outstanding for all prior periods has been retroactively restated to reflect the Company's two-for-one common stock split effected in the form of a common stock dividend distributed on April 1, 2014.