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Stockholders' Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stockholders Equity Note [Line Items]
Stock-based compensation expense	$ 5.9	$ 7.0
Stock-based compensation expense realized tax benefits from the excess of deductible amounts over expense recognized	$ 0.8	$ 0.4
Additional common shares issued under deferred and stock compensation arrangements	318,454

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from equity-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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- Definition

The number of shares newly issued during the reporting period under the plan.

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