Effect on the Individual Line Items within Operating Cash Flows on the Company's Consolidated Statement of Cash Flows (Detail) (USD $) In Thousands	3 Months Ended						6 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Sep. 30, 2009	Jun. 30, 2009	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2009	Sep. 30, 2010	Sep. 30, 2009	Dec. 31, 2010	Dec. 31, 2009
Net Income (Loss)	$ 78,410	$ 350,179	$ 53,731	$ 79,843	$ 229,708	$ (36,276)	$ 171,901	$ 133,574	$ (72,514)	$ 483,753	$ 157,195	$ 515,653	$ 152,485
Decrease in accrued expenses and other liabilities							(21,931)	(13,572)
Other, net							(4,510)	7,862
As Previously Reported
Net Income (Loss)	91,552	356,767	60,546	87,447	230,392	(35,086)		147,993	(71,324)	504,760	159,068	547,467	162,421
Decrease in accrued expenses and other liabilities								(13,514)
Other, net								733
Adjustment
Net Income (Loss)	(13,142)	(6,588)	(6,815)	(7,604)	(684)	(1,190)		(14,419)	(1,190)	(21,007)	(1,873)	(31,814)	(9,936)
Decrease in accrued expenses and other liabilities								(58)
Other, net								14,477
Reclassifications
Other, net								$ (7,348)