Effect of Derivative Instruments Qualifying and Designated as Hedging Instruments and the Related Hedged Items in Fair Value Hedges on the Consolidated Statement of Operations (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 11,767	$ (52,739)	$ 33,156	$ (95,320)
Amount of Gain (Loss) Recognized in Income on Hedged Item	1,010	71,301	(9,169)	134,688
Interest rate swaps | Interest expense, net of interest capitalized
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	4,444	12,919	8,881	28,812
Amount of Gain (Loss) Recognized in Income on Hedged Item	7,971		15,594
Interest rate swaps | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	7,333	6,280	1,374	27,018
Amount of Gain (Loss) Recognized in Income on Hedged Item	(6,933)	(4,763)	(1,043)	(26,160)
Cross currency swaps | Interest expense, net of interest capitalized
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative		208		987
Cross currency swaps | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative		(22,238)		(42,284)
Amount of Gain (Loss) Recognized in Income on Hedged Item		23,640		47,715
Foreign currency forward contracts | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	(10)	(49,908)	22,901	(109,853)
Amount of Gain (Loss) Recognized in Income on Hedged Item	$ (28)	$ 52,424	$ (23,720)	$ 113,133