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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Jun. 30, 2011	Oct. 31, 2010 Noncompete Agreements	Jun. 30, 2011 Noncompete Agreements	Jun. 30, 2011 Noncompete Agreements Year	Jun. 30, 2011 Customer Relationships	Jun. 30, 2011 Customer Relationships Year	Dec. 31, 2010 Pressure Pumping	Oct. 01, 2010 Pressure Pumping
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill expected to be deductible for tax purposes							$ 53,200,000
Goodwill acquired in the period							67,600,000
Intangible Assets								26,900,000
Contract term		3 years
Amortization period (in years)				3		7
Amortization expense	$ 2,055,000		$ 117,000	$ 233,000	$ 910,000	$ 1,822,000

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Goodwill and Intangible Assets Disclosure [Line Items]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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The useful life of all finite-lived intangible assets.

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The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

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