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Business Segments - Income Before Income Taxes (Detail) (USD $) In Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | $ 132,294 |  | $ 52,509 |  | $ 381,701 |  | $ 106,097 |
Net gain on asset disposals | 1,437 | [1] | 250 | [1] | 4,058 | [1] | 21,940 | [1]
Interest income | 47 |  | 64 |  | 135 |  | 1,631 |
Interest expense | (3,835) |  | (6,227) |  | (11,238) |  | (9,011) |
Other | 375 |  | 260 |  | 572 |  | 509 |
Income from continuing operations before income taxes | 128,881 |  | 46,606 |  | 371,170 |  | 99,226 |
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | 140,888 |  | 61,530 |  | 410,207 |  | 109,257 |
Operating Segments | Contract Drilling |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | 85,708 |  | 41,479 |  | 251,362 |  | 72,279 |
Operating Segments | Pressure Pumping |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | 50,426 |  | 17,586 |  | 142,144 |  | 28,769 |
Operating Segments | Oil and Natural Gas |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | 4,754 |  | 2,465 |  | 16,701 |  | 8,209 |
Significant Reconciling Items |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |
Operating income (loss) | $ (10,031) |  | $ (9,271) |  | $ (32,564) |  | $ (25,100) |
[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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