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Common Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 28, 2011	Dec. 31, 2012
Share Repurchases [Line Items]
Common stock repurchased (in shares)		1.7
Repurchase of common stock, average price per share (usd per share)		$ 27.28
Common Stock Repurchase Program
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized	$ 150.0
Remaining authorized amount (in shares)		95.1
Additional Paid-in Capital
Share Repurchases [Line Items]
Repurchase of common stock, aggregate purchase price - Increase/(Decrease) In Equity		(15.4)
Retained Earnings
Share Repurchases [Line Items]
Repurchase of common stock, aggregate purchase price - Increase/(Decrease) In Equity		$ (31.8)

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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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- Definition

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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