Cash Flow Activities (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Net (increase) decrease in operating working capital other than cash and cash equivalents:
Increase in accounts receivable	$ (98,163)	$ (314,908)
Increase in inventories	(168,840)	(31,865)
Increase in prepaid expenses	(148,904)	(28,693)
Decrease in deferred income tax assets	23,939	4,797
Increase in accounts payable and accrued liabilities	94,457	189,833
Increase (decrease) in current income tax liabilities	80,271	(124,385)
Total	(217,240)	(305,221)	[1]
Supplementary disclosures:
Cash income taxes paid	414,676	608,065
Interest paid, net of amounts capitalized	$ 1,077	$ 18,124

[1] Reclassified to conform to current presentation.