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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2010
Entity
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Business Acquisition [Line Items]        
Business acquisition date 2010-10-01      
Subsidiaries completed acquisition of certain assets 2      
Total purchase price $ 241,308,000      
Acquisition-related expenses     2,485,000  
Revenue from acquired business   2,565,943,000 1,462,931,000 781,946,000
Operating income (loss) from acquired business   525,601,000 200,925,000 (48,214,000)
Non-compete agreement
        
Business Acquisition [Line Items]        
Amortization period (in years)   3    
Key Electric Wireline Services, LLC
        
Business Acquisition [Line Items]        
Revenue from acquired business     5,700,000  
Operating income (loss) from acquired business     (1,500,000)  
Impairment of the assets to be disposed     2,200,000  
Key Energy Pressure Pumping Services, LLC
        
Business Acquisition [Line Items]        
Revenue from acquired business     84,700,000  
Operating income (loss) from acquired business     $ 22,800,000