Income Taxes (Summary of Uncertain Tax Positions Included in Income Tax Provision) (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
Income Tax Disclosure [Line Items]
Current provision for UTPs	$ 52,934	$ (12,004)	$ 51,021	$ (14,483)
Deferred benefit for UTPs	(7,084)	12,236	(6,646)	16,503
Total income tax (provision) benefit for UTPs	45,850	232	44,375	2,020
(Provision) benefit for UTPs included in income from discontinued operations	(1,111)	1,266	(3,228)	2,159
Benefit (provision) for UTPs on income from continuing operations	$ 46,961	$ (1,034)	$ 47,603	$ (139)