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Employee Benefit Plans (Stock-Based Compensation Expense) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options	$ 9,663	$ 10,834	$ 9,839
Non-vested stock awards/stock units	2,843	4,799	4,786
Deferred stock-units	330	330	300
Total	12,836	15,963	14,925
Income tax benefit	$ 4,493	$ 5,587	$ 5,224

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

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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