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Acquisitions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Oct. 31, 2010
Key Energy Pressure Pumping Services, LLC
Entity
Jun. 30, 2011
Key Energy Pressure Pumping Services, LLC
Jun. 30, 2011
Key Energy Pressure Pumping Services, LLC
Business Acquisition [Line Items]              
Business acquisition date         2010-10-01    
Subsidiaries completed acquisition of certain assets         2    
Revenue from acquired business $ 600,064 $ 306,992 $ 1,167,468 $ 578,590   $ 99,600 $ 196,000
Income from operation acquired business $ 131,860 $ 45,757 $ 249,407 $ 53,588   $ 22,300 $ 49,900