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Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	3 Months Ended	9 Months Ended
	May 08, 2013	Sep. 30, 2013	Sep. 30, 2013
Equity [Abstract]
Share repurchase program, authorized amount	$ 50
Stock repurchased amount		$ 12.6	$ 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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