Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment, Net [Abstract]
Land	$ 22,120	$ 12,087
Buildings	132,753	122,635
Drilling, workover and well-servicing rigs, and related equipment	11,150,927	10,632,968
Marine transportation and supply vessels	14,023	13,663
Oilfield hauling and mobile equipment	1,171,930	551,892
Other machinery and equipment	248,938	143,976
Oil and gas properties	42,033	664,289
Construction in process	815,987	349,455
Property, plant and equipment, gross	13,598,711	12,490,965
Less: accumulated depreciation and amortization	(4,928,781)	(4,182,122)
Less: accumulated depletion on oil and gas properties	(39,984)	(493,424)
Property, plant and equipment, net	$ 8,629,946	$ 7,815,419	$ 7,646,050