Capital Management - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Dec. 31, 2013
Equity [Abstract]
Share repurchase new limit amount	$ 25.0	$ 25.0
Share repurchase program expiration date			Dec. 31, 2014
Shares repurchased			1,258,250
Shares repurchased, value			$ 22.4
Shares repurchased, average price			$ 17.78
Quarterly dividend			$ 0.08