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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.

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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 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

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