Cash Flow Activities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Net increase in operating working capital other than cash and cash equivalents:
(Increase) decrease in accounts receivable	$ 292,226	$ (289,404)
(Increase) decrease in inventories	(96,612)	(151,125)
(Increase) decrease in prepaid expenses	(118,139)	(37,919)
(Increase) decrease in deferred income tax assets	22,690	2,567
Increase (decrease) in accounts payable and accrued liabilities	(247,951)	4,140
Increase (decrease) in current income tax liabilities	44,530	16,086
Total	(103,256)	(455,655)	[1]
Supplementary disclosures:
Cash income taxes paid	326,727	375,666
Interest paid, net of amounts capitalized	$ 8,657	$ 14,896

[1] Reclassified to conform to current presentation.