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Acquisitions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Oct. 31, 2010 Key Energy Pressure Pumping Services, LLC Entity	Sep. 30, 2011 Key Energy Pressure Pumping Services, LLC	Sep. 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	$ 673,828	$ 378,663	$ 1,841,296	$ 957,253		$ 127,000	$ 324,000
Income from operation acquired business	$ 132,294	$ 52,509	$ 381,701	$ 106,097		$ 28,000	$ 77,900

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Month, date and year in which the acquirer obtains control of the acquiree.

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