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Business Segments - Income (loss) from Continuing Operations Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | $ 70,606 |  |  | $ 150,894 |  | $ 165,538 |  | $ 308,558 |
Net gain (loss) on asset disposals | 1,033 | [1] |  | 28,332 | [1] | 908 | [1] | 30,732 | [1]
Interest income | 250 |  |  | 179 |  | 423 |  | 233 |
Interest expense | (6,941) |  | (978) | (5,051) |  | (13,707) |  | (9,633) |
Other | 381 |  |  | (144) |  | 400 |  | (89) |
Income before income taxes | 64,296 |  |  | 145,878 |  | 152,654 |  | 299,069 |
Operating Segments |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | 82,850 |  |  | 134,606 |  | 190,155 |  | 300,682 |
Operating Segments | Contract Drilling |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | 47,069 |  |  | 90,536 |  | 119,618 |  | 202,307 |
Operating Segments | Pressure Pumping |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | 30,254 |  |  | 36,846 |  | 58,769 |  | 83,633 |
Operating Segments | Oil and Natural Gas |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | 5,527 |  |  | 7,224 |  | 11,768 |  | 14,742 |
Corporate and other |  |  |  |  |  |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |  |  |  |  |  |
Operating income (loss) | $ (13,277) |  |  | $ (12,044) |  | $ (25,525) |  | $ (22,856) |
[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 Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: 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=31042434&loc=d3e3602-108585 + Details
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