Amounts recorded in AOCI related to cash flow hedging instruments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Ending balance	$ (117,390)	$ (126,648)
Net Investment Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Beginning balance	45,417	111,115
Foreign currency translation adjustment	(200,121)	(33,208)
Changes in fair value of foreign currency debt	(9,553)	(16,311)
Changes in fair value of derivative hedge instruments	20,527	(16,179)
Total activity	(189,147)	(65,698)
Ending balance	(143,730)	45,417
Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Beginning balance	(1,468)	(4,799)
Changes in fair value of derivatives	(14,357)	1,248
Reclassifications to earnings from equity	3,088	2,083
Total activity	(11,269)	3,331
Ending balance	$ (12,737)	$ (1,468)