Intra Period Allocation of Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	12 Months Ended
	Jun. 30, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Examination [Line Items]
Continuing operations		$ (88,155)	$ (42,851)	$ (85,894)
Discontinued operations			3,384	10,642
Gain on sale of discontinued operations	35,116		35,116
Income Tax Expense (Benefit), Intraperiod Tax Allocation, Total		$ (88,155)	$ (4,351)	$ (75,252)