XML 35 R50.htm IDEA: XBRL DOCUMENT v2.4.0.8
Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Impairment charges related to oil and natural gas properties $ 4.0 $ 1.9 $ 3.0
Proceeds from sale of oil and natural gas properties   42.5  
Gain on sale of oil and natural gas properties   22.6  
Mechanically powered drilling rigs
     
Property, Plant and Equipment [Line Items]      
Number of drilling rigs 55    
Impairment charges of fleets 29.9    
Contract Drilling Equipments
     
Property, Plant and Equipment [Line Items]      
Proceeds from sale of oil and natural gas properties   10.6  
Gain on sale of oil and natural gas properties   4.5  
Drilling Rigs That Would No Longer Be Marketed As Rigs
     
Property, Plant and Equipment [Line Items]      
Number of drilling rigs 48 36 53
Impairment charges of fleets 7.9 5.2 15.7
Pressure Pumping
     
Property, Plant and Equipment [Line Items]      
Impairment charges of fleets   $ 7.3  
Number of horsepower of pressure pumping equipment that would no longer be marketed   37,000