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Acquisitions - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Oct. 31, 2010
Entity
Dec. 31, 2010
Dec. 31, 2010
Key Electric Wireline Services, LLC
Dec. 31, 2010
Key Energy Pressure Pumping Services, LLC
Dec. 31, 2012
Non-compete Agreement
Business Acquisition [Line Items]          
Business acquisition date Oct. 01, 2010        
Subsidiaries completed acquisition of certain assets 2        
Total purchase price $ 241,308,000        
Intangible asset, useful Life         3 years
Acquisition-related expenses   2,485,000      
Revenue from acquired business     5,700,000 84,700,000  
Operating income (loss) from acquired business     (1,500,000) 22,800,000  
Impairment of the assets to be disposed     $ 2,200,000