Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended		3 Months Ended		2 Months Ended
	May 07, 2014	Dec. 31, 2014	Dec. 31, 2013	Feb. 10, 2014	Jun. 30, 2014	Dec. 31, 2014	Apr. 30, 2014	Feb. 28, 2014	Oct. 24, 2013	Feb. 19, 2014	Oct. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Stock split description		Each stockholder to receive one additional share of common stock, par value $0.01, for each share they held as of the record date. All common stock share and per share data for all periods presented in the accompanying consolidated financial statements and related notes are presented on a post-split basis.
Common stock, par value	$ 0.01	$ 0.01	$ 0.01			0.01		$ 0.01
Stock split conversion ratio	2
Number of authorized shares of common stock		80,000,000	80,000,000			80,000,000	80,000,000
Value of shares repurchased by the Company		$ 50,000,000	$ 25,000,000
October 2013 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized amount									30,000,000
Number of shares repurchased by the Company				0
Common stock repurchase program, expiration date		Feb. 10, 2014
February 2014 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized amount										50,000,000
Number of shares repurchased by the Company					1,657,919
Value of shares repurchased by the Company					$ 50,000,000
Shares repurchased by the Company, Average price per share					$ 30.16
October 2014 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company						0
Common stock repurchase program, authorized shares											2,000,000
Scenario, Previously Reported [Member]
Equity, Class of Treasury Stock [Line Items]
Number of authorized shares of common stock							40,000,000