Income Taxes - Summary of Income Tax Provision and Effective Tax Rate for Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Contingency [Line Items]
Pretax loss	$ (63,162)	$ (104,890)	$ (88,146)	$ (56,443)
Benefit from income taxes	$ (33,274)	$ (19,027)	$ (44,240)	$ (11,930)
Effective rate	(52.70%)	(18.10%)	(50.20%)	(21.10%)