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Business Segments - Assets (Detail) (USD $) In Thousands | Jun. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 3,777,589 |  | $ 3,423,031 |
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 2,950,576 |  | 2,678,250 |
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 638,255 |  | 533,597 |
Operating Segments | Oil and Natural Gas |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | 40,751 |  | 36,508 |
Significant Reconciling Items |  |  |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 148,007 | [1] | $ 174,676 | [1]
[1] | Corporate and other assets at December 31, 2010 primarily include assets held for sale as well as cash on hand, income taxes receivable and certain deferred tax assets. Corporate and other assets at June 30, 2011 primarily include cash on hand and certain deferred tax assets.

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Topic 210 -SubTopic 10 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 -Section S99 -Name Accounting Standards Codification -Publisher FASB -Paragraph 1 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 25 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + Details
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