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Business Segments - Revenues (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Oil and natural gas | $ 59,930 |  | $ 50,559 |  | $ 30,425 |
Revenues | 2,723,414 |  | 2,565,943 |  | 1,462,931 |
Operating Segments |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Oil and natural gas | 59,930 |  | 50,559 |  | 30,425 |
Revenues | 2,728,220 |  | 2,569,991 |  | 1,466,755 |
Operating Segments | Contract Drilling |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Oil and gas services | 1,826,519 |  | 1,673,629 |  | 1,085,722 |
Operating Segments | Pressure Pumping |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Oil and gas services | 841,771 |  | 845,803 |  | 350,608 |
Intersegment Elimination |  |  |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |
Revenues | $ (4,806) | [1] | $ (4,048) | [1] | $ (3,824) | [1]
[1] | Includes contract drilling intercompany revenues related to 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=8451039&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=8451039&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 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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