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		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	$ 15,172	$ 80,324	$ 48,328	$ (14,996)
Amount of Gain (Loss) Recognized in Income on Hedged Item	(2,719)	(70,217)	(11,888)	64,471
Interest rate swaps | Interest expense, net of interest capitalized
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	4,484	11,779	13,365	40,591
Amount of Gain (Loss) Recognized in Income on Hedged Item	7,910		23,504
Interest rate swaps | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative	10,688	10,666	12,062	37,684
Amount of Gain (Loss) Recognized in Income on Hedged Item	(10,629)	(9,694)	(11,672)	(35,854)
Cross currency swaps | Interest expense, net of interest capitalized
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative				987
Cross currency swaps | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative				(42,284)
Amount of Gain (Loss) Recognized in Income on Hedged Item				47,715
Foreign currency forward contracts | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivative		57,879	22,901	(51,974)
Amount of Gain (Loss) Recognized in Income on Hedged Item		$ (60,523)	$ (23,720)	$ 52,610