Summary of Significant Accounting Policies (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended
Mar. 31, 2013	Mar. 31, 2013 Drilling and Rig Services	Mar. 31, 2013 U.S.	Dec. 31, 2012 U.S.	Mar. 31, 2013 Rig Services	Mar. 31, 2013 Completion and Production Services	Dec. 31, 2012 Completion and Production Services
Change in the carrying amount of goodwill for various contract drilling segments and other operating segments
Beginning Balance	$ 472,326	$ 82,262	$ 50,149	$ 50,149	$ 32,113	$ 390,064	$ 390,064
Acquisitions and purchase price adjustment	15,828	15,828			15,828
Cumulative Translation Adjustment	(394)	(394)			(394)
Ending Balance	$ 487,760	$ 97,696	$ 50,149	$ 50,149	$ 47,547	$ 390,064	$ 390,064

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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