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Business Segments - Revenues (Detail) (USD $) In Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 600,064		$ 306,992		$ 1,167,468		$ 578,590
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	601,207		307,920		1,169,278		580,250
Operating Segments | Contract Drilling
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	387,622		240,894		765,647		452,371
Operating Segments | Pressure Pumping
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	200,131		59,364		379,790		113,115
Operating Segments | Oil and Natural Gas
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	13,454		7,662		23,841		14,764
Intersegment Elimination
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ (1,143)	[1]	$ (928)	[1]	$ (1,810)	[1]	$ (1,660)	[1]
[1] Consists of contract drilling intercompany revenues for drilling services provided to the oil and natural gas exploration and production segment.

X

- 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 1

Reference 2: 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=6880815&loc=d3e20235-122688

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

Name:	us-gaap_SegmentReportingRevenueReconcilingItemLineItems
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration