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Business Segments - Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 4,687,127 $ 4,556,911 $ 4,221,901
Operating Segments | Contract Drilling
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 3,569,588 3,538,289 3,252,116
Operating Segments | Pressure Pumping
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 761,199 784,128 748,643
Operating Segments | Oil and Natural Gas
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 58,656 54,188 44,990
Corporate and other
      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 297,684 [1] $ 180,306 [1] $ 176,152 [1]
[1] Corporate and other assets primarily include cash on hand and certain deferred tax assets.