Stock-Based Compensation and Other Employee Benefit Plans (Summary Of Stock-Based Compensation Expense And Related Tax Benefits) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,433,000		$ 3,573,000		$ 3,872,000
Income tax benefit from stock-based compensation	2,500,000		6,300,000		1,000,000
Excess tax benefit from stock-based compensation	759,000	[1]	7,766,000	[1]	0	[1]
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	4,400,000		3,600,000		3,800,000
Income tax benefit from stock-based compensation	1,800,000		3,400,000		1,300,000
Excess tax benefit from stock-based compensation	100,000	[1]	2,100,000	[1]	0	[1]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0		0		100,000
Income tax benefit from stock-based compensation	700,000		2,900,000		(300,000)
Excess tax benefit from stock-based compensation	$ 700,000	[1]	$ 5,700,000	[1]	$ 0	[1]

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