Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	9 Months Ended						3 Months Ended
	May 07, 2014	Sep. 30, 2014	May 07, 2014	Apr. 30, 2014	Feb. 28, 2014	Dec. 31, 2013	Apr. 30, 2014 Scenario, Previously Reported [Member]	Jun. 30, 2014 February 2014 Stock Repurchase Program [Member]	Feb. 28, 2014 February 2014 Stock Repurchase Program [Member]	Oct. 23, 2014 October 2014 Stock Repurchase Program [Member] Subsequent Event [Member]
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 unaudited condensed consolidated financial statements and notes thereto are presented on a post-split basis.
Common stock, par value		$ 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	40,000,000
Common stock repurchase authorized amount									$ 50
Number of shares repurchased by the Company								1,657,919
Value of shares repurchased by the Company								$ 50.0
Shares repurchased by the Company, Average price per share								$ 30.16
Common stock repurchase program, authorized shares										2,000,000