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Business Segments - Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Assets |  | $ 5,049,528 | $ 5,394,011
Operating Segments | Contract Drilling |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Assets |  | 3,859,000 | 4,000,576
Operating Segments | Pressure Pumping |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Assets |  | 1,049,778 | 1,186,010
Operating Segments | Oil And Natural Gas |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Assets |  | 41,684 | 50,945
Corporate and other |  |  |
Segment Reporting Asset Reconciling Item [Line Items] |  |  |
Assets | [1] | $ 99,066 | $ 156,480
[1] | Corporate and other assets primarily include cash on hand, income tax receivables and certain deferred tax assets.

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