Stock-Based Compensation and Other Employee Benefit Plans (Summary Of Stock-Based Compensation Expense And Related Tax Benefits (Expense)) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,357,000		$ 993,000
Income tax benefit (expense) from stock-based compensation	1,500,000		500,000
Excess tax benefit from stock-based compensation	903,000	[1]	97,000	[1]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,400,000		1,000,000
Income tax benefit (expense) from stock-based compensation	700,000		400,000
Excess tax benefit from stock-based compensation	100,000	[1]	0	[1]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0		0
Income tax benefit (expense) from stock-based compensation	800,000		100,000
Excess tax benefit from stock-based compensation	$ 800,000	[1]	$ 100,000	[1]

[1] Excess tax benefits, which represent cash flows from tax deductions in excess of the tax effect of compensation expense recognized for stock options exercised and vested restricted shares, are classified as financing cash flows in the Company’s condensed unaudited consolidated statements of cash flows.