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Business Segments - Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 4,812,895 $ 4,687,127
Operating Segments | Contract Drilling
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 3,675,034 3,569,588
Operating Segments | Pressure Pumping
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 780,162 761,199
Operating Segments | Oil and Natural Gas
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets 60,461 58,656
Corporate and other
    
Segment Reporting, Asset Reconciling Item [Line Items]    
Assets $ 297,238 [1] $ 297,684 [1]
[1] Corporate and other assets primarily include cash on hand and certain deferred tax assets.