Earnings Per Share - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Dec. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share amount		500,000	0
Additional authorized repurchase amount	$ 93.0
Number of shares repurchased		331,369	208,274
Repurchase of common stock, value		$ 13.7	$ 7.8
Treasury stock reissued, shares		73,750	563,551