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Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stockholders Equity Note [Line Items]
Dividends declared per common share (in USD per share)	$ 0.45
Dividend equivalents paid on outstanding restricted stock units	$ 1.6	$ 1.4
Common Stock
Stockholders Equity Note [Line Items]
Repurchased common stock (shares)	169,809	56,812
Average repurchase price of common stock (in USD per share)	$ 58.93	$ 44.00
Restricted Stock Units
Stockholders Equity Note [Line Items]
Restricted stock units vested and issued as common stock (shares)	482,711	553,729
Repurchased shares for award (shares)	177,969	146,875
Average repurchase price of shares for award (shares)	$ 58.88	$ 46.83

The number of shares purchased on the open market during the period for issuance to employees under the plan.

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- Definition

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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