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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (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, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | $ 497,361 |  | $ 525,601 |  | $ 200,925 |
Net gain on asset disposals | 33,806 | [1] | 4,999 | [1] | 22,812 | [1]
Interest income | 554 |  | 187 |  | 1,674 |
Interest expense | (22,750) |  | (15,652) |  | (12,772) |
Other | 508 |  | 582 |  | 927 |
Income from continuing operations before income taxes | 475,673 |  | 510,718 |  | 190,754 |
Operating Segments |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | 509,398 |  | 563,505 |  | 215,132 |
Operating Segments | Contract Drilling |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | 349,393 |  | 346,083 |  | 140,483 |
Operating Segments | Pressure Pumping |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | 132,795 |  | 193,440 |  | 62,194 |
Operating Segments | Oil and Natural Gas |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | 27,210 |  | 23,982 |  | 12,455 |
Corporate and other |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |
Operating income (loss) | $ (45,843) |  | $ (42,903) |  | $ (37,019) |
[1] | Net gains or losses associated with the disposal of assets relate to corporate strategy decisions of the executive management group. Accordingly, the related gains or losses have been separately presented and excluded from the results of specific segments.

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- Definition The difference between the sale price or salvage price and the book value of a property, plant, and equipment asset that was sold or retired during the reporting period. This element refers to the gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
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