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Business Segments - Capital Expenditures (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 1,011,578 | $ 738,090 | $ 452,646
Operating Segments | Contract Drilling |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 784,686 | 655,550 | 395,376
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 198,061 | 51,064 | 43,144
Operating Segments | Oil and Natural Gas |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 22,884 | 23,067 | 7,341
Corporate and other |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 5,947 | $ 8,409 | $ 6,785

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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