Summary of Significant Accounting Policies (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	$ 512,964,000	$ 472,326,000
Acquisitions and purchase price adjustment	18,818,000	51,318,000
Disposals and Impairments	(356,605,000)	(9,631,000)
Cumulative Translation Adjustment	(1,249,000)	(1,049,000)
Goodwill, Ending Balance	173,928,000	512,964,000
Discontinued Operation, additional disclosures
Goodwill for the consolidated company, expected to be deductible for tax purposes	75,600,000
Subtotal drilling and rig services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	87,410,000	82,262,000
Acquisitions and purchase price adjustment	17,268,000	15,828,000
Disposals and Impairments	(21,613,000)	(9,631,000)
Cumulative Translation Adjustment	(1,249,000)	(1,049,000)
Goodwill, Ending Balance	81,816,000	87,410,000
U.S.
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance			50,149,000
Goodwill, Ending Balance	50,149,000	50,149,000	50,149,000
Rig Services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	37,261,000	32,113,000
Acquisitions and purchase price adjustment	17,268,000	15,828,000
Disposals and Impairments	(21,613,000)	(9,631,000)
Cumulative Translation Adjustment	(1,249,000)	(1,049,000)
Goodwill, Ending Balance	31,667,000	37,261,000
Subtotal completion and production services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	425,554,000	390,064,000
Acquisitions and purchase price adjustment	1,550,000	35,490,000
Disposals and Impairments	(334,992,000)
Goodwill, Ending Balance	92,112,000	425,554,000
Completion Services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	334,992,000		334,992,000
Disposals and Impairments	(334,992,000)
Goodwill, Ending Balance			334,992,000
Production Services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Goodwill, Beginning Balance	90,562,000	55,072,000
Acquisitions and purchase price adjustment	1,550,000	35,490,000
Goodwill, Ending Balance	$ 92,112,000	$ 90,562,000