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Business Segments - Revenues (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		$ 422,251	$ 845,628	$ 1,552,711	$ 2,281,072
Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		422,630	848,027	1,554,120	2,285,974
Operating Segments | Contract Drilling
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		262,196	483,307	953,025	1,350,296
Operating Segments | Pressure Pumping
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		154,407	349,996	580,752	896,834
Operating Segments | Oil And Natural Gas
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues		6,027	14,724	20,343	38,844
Intersegment Elimination
Segment Reporting Revenue Reconciling Item [Line Items]
Total operating revenues	[1]	$ (379)	$ (2,399)	$ (1,409)	$ (4,902)
[1] Consists of contract drilling and, in 2014, pressure pumping intercompany revenues for services provided to the oil and natural gas exploration and production segment.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.1)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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