Corrected Consolidated Condensed Financial Statements (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Provision for income taxes	$ 2,196	$ 45,483	$ 1,904	$ 54,263
Net loss	2,799	(59,066)	34,601	(46,248)
Net loss allocable to common shareholders	174	(61,691)	29,351	(51,498)
Loss per common share basic and diluted		$ (0.96)		$ (0.80)
As Previously Reported
Provision for income taxes		49,981		58,761
Net loss		(63,564)		(50,746)
Net loss allocable to common shareholders		$ (66,189)		$ (55,996)
Loss per common share basic and diluted		$ (1.03)		$ (0.87)