Information about Operations in Different Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Segment Reporting Information [Line Items]
Revenues	$ 816,175	$ 879,894	$ 849,801	$ 899,240	$ 539,622	$ 732,095	$ 627,144	$ 504,882	$ 3,445,110		$ 2,403,743		$ 3,281,790
Eliminations									(297)		(20,613)		(75,379)
Total adjustments and eliminations
Operating income	31,430	35,216	83,779	100,298	59,273	84,303	98,142	73,187	250,723		314,905		279,349
Capital expenditures									282,621		186,862		186,518
Depreciation and amortization									82,391		76,452		79,867
Gain loss on asset disposals and impairment, net									(2,990)		22,220		(914)
Asia Pacific
Segment Reporting Information [Line Items]
Revenues									1,898,033	[1]	870,410	[1]	997,938	[1]
Intersegment transfers and eliminations											154
Operating income									202,969		88,012		141,494
Capital expenditures									86,081		25,345		47,680
Depreciation and amortization									25,698		19,002		22,347
Gain loss on asset disposals and impairment, net									1,784		155		1,082
Atlantic
Segment Reporting Information [Line Items]
Revenues									267,019		183,001		230,428
Intersegment transfers and eliminations									297		20,129		71,136
Operating income									(174,152)		(89,692)		(20,942)
Capital expenditures									147,062		100,673		20,122
Depreciation and amortization									15,348		17,681		15,688
Gain loss on asset disposals and impairment, net									(7,329)		24,444		(62)
Middle East
Segment Reporting Information [Line Items]
Revenues									1,280,058	[2]	1,350,332	[2]	2,053,424	[2]
Intersegment transfers and eliminations											330		4,243
Operating income									221,906		316,585		158,797
Capital expenditures									35,762		47,851		90,893
Depreciation and amortization									28,740		24,357		21,827
Gain loss on asset disposals and impairment, net									1,831		(2,565)		(1,867)
Corporate and other
Segment Reporting Information [Line Items]
Capital expenditures									13,716		12,993		27,823
Depreciation and amortization									12,605		15,412		20,005
Gain loss on asset disposals and impairment, net									$ 724		$ 186		$ (67)

[1] Includes revenues from Exxon Mobil Corporation and Chevron Corporation, which account for 36% and 10%, respectively, of our 2011 consolidated revenues.

[2] Includes revenues from Saudi Aramco, which accounts for 24% of our 2011 consolidated revenues.