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Business Segments - Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 4,908,367 $ 4,687,127
Corporate and Other
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 151,645 [1] 297,684 [1]
Operating Segments | Contract Drilling
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,801,864 3,569,588
Operating Segments | Pressure Pumping
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 890,870 761,199
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 63,988 $ 58,656
[1] Corporate and other assets primarily include cash on hand and certain deferred tax assets.