Geographic Information On Revenues From External Customers (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011		Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Untied States	$ 18,729,900,000	$ 18,184,000,000		$ 14,386,600,000
Total revenues	28,626,046,000	27,638,121,000	[1]	20,036,150,000	[1]
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Foreign	1,119,900,000	1,180,300,000		809,300,000
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Foreign	2,415,600,000	2,063,000,000		1,793,800,000
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Foreign	6,302,700,000	6,037,400,000		2,885,100,000
Republic of the Congo
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Foreign	57,600,000	148,800,000		156,500,000
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues from External Customers, Foreign	$ 300,000	$ 24,600,000		$ 4,800,000

[1] Reclassified to conform to current presentation.