Share Repurchase Program - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended	1 Months Ended
	Jan. 31, 2014	Jun. 30, 2014	Jul. 31, 2014 Subsequent Event
Equity Class Of Treasury Stock [Line Items]
Authorized a share repurchase program	$ 35.0		$ 65.0
Common stock shares repurchased		242,787
Cost of common stock shares repurchased		$ 13.7
Shares repurchase program expiration date		Dec. 31, 2015