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Business Segments - Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Segment Reporting Asset Reconciling Item [Line Items]
Assets		$ 5,049,528	$ 5,394,011
Operating Segments | Contract Drilling
Segment Reporting Asset Reconciling Item [Line Items]
Assets		3,859,000	4,000,576
Operating Segments | Pressure Pumping
Segment Reporting Asset Reconciling Item [Line Items]
Assets		1,049,778	1,186,010
Operating Segments | Oil And Natural Gas
Segment Reporting Asset Reconciling Item [Line Items]
Assets		41,684	50,945
Corporate and other
Segment Reporting Asset Reconciling Item [Line Items]
Assets	[1]	$ 99,066	$ 156,480
[1] Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.18)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 12



-Article 7

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- Definition

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+ References

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