Share Repurchase Program - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Jul. 31, 2014	Jan. 31, 2014
Stock Transactions Parenthetical Disclosures [Abstract]
Authorized a share repurchase program		$ 65,000,000	$ 35,000,000
Common stock shares repurchased	454,185
Cost of common stock shares repurchased	$ 25,400,000
Shares repurchase program expiration date	Dec. 31, 2015