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Subsequent Events - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
	Mar. 24, 2014	May 08, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, authorized amount		$ 50
Stock repurchased amount	$ 39.5

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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