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Recognition of Pre-Tax Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized pre-tax compensation expense	$ 5,711	$ 8,788	$ 21,274	$ 33,805
Restricted Stock Awards and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized pre-tax compensation expense	5,711	8,693	21,223	33,462
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized pre-tax compensation expense		$ 95	$ 51	$ 343

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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