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Business Segments - Assets (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 4,968,349 |  | $ 4,687,127 |
Corporate and Other |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 71,540 | [1] | 297,684 | [1]
Operating Segments | Contract Drilling |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 3,859,415 |  | 3,569,588 |
Operating Segments | Pressure Pumping |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | 970,327 |  | 761,199 |
Operating Segments | Oil and Natural Gas |  |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |  |
Assets | $ 67,067 |  | $ 58,656 |
[1] | (c)Corporate and other assets primarily include cash on hand and certain deferred tax assets.

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