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Earnings Per Share Data ("EPS") and Stock Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average stock options excluded from antidilutive securities	2,600,000		2,600,000
Unrecognized compensation cost related to unvested options and restricted stock	$ 45,300,000		$ 45,300,000
Unrecognized compensation cost, remaining weighted average vesting period in years			2 years 10 months 24 days
Stock options granted during period (net of cancellations)			2,870,200
Weighted-average grant date fair value, per share			$ 10.72
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized	4,700,000	4,200,000	9,600,000	7,700,000
Compensation cost recognized, after-tax	2,900,000	2,600,000	6,000,000	4,700,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost recognized	593,000	455,000	1,200,000	906,000
Compensation cost recognized, after-tax	$ 369,000	$ 281,000	$ 727,000	$ 559,000
Restricted stock shares granted			54,127
Weighted-average grant date fair value, per share			$ 36.95

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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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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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