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Business Segments - Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Oil and natural gas | $ 14,717 |  | $ 10,387 |
Revenues | 745,921 |  | 567,404 |
Operating Segments |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Oil and natural gas | 14,717 |  | 10,387 |
Revenues | 747,142 |  | 568,071 |
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Oil and gas services | 490,703 |  | 378,025 |
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Oil and gas services | 241,722 |  | 179,659 |
Intersegment Elimination |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Revenues | $ (1,221) | [1] | $ (667) | [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 Revenue from the sale of oil and gas during the period. + 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=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e62136-109447 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=6821537&loc=d3e62246-109447 + Details
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- Definition Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period. + 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(d)) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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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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- Details
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