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VARIABLE INTEREST ENTITIES - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
person
Mar. 31, 2010
AlMansoori Petroleum Services Limited Liability Company
Mar. 31, 2010
Key Energy Services Incorporation and Subsidiaries
Dec. 31, 2012
Key Energy Services Incorporation and Subsidiaries
person
Variable Interest Entity [Line Items]                
Variable interest entities, ownership interest           51.00% 49.00%  
Number of Board of Directors seats         5     3
Variable interest entities, revenue $ 4.6 $ 4.0 $ 8.6 $ 7.3        
Variable interest entities, net income 0.8 0.8 1.7 1.0        
Variable interest entities, assets 16.6   16.6   16.2      
Variable interest entities, liabilities $ 13.4   $ 13.4   $ 14.7