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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended
	Oct. 31, 2010 Noncompete Agreements	Sep. 30, 2011 Noncompete Agreements	Sep. 30, 2011 Noncompete Agreements Year	Sep. 30, 2011 Customer Relationships	Sep. 30, 2011 Customer Relationships Year	Dec. 31, 2010 Pressure Pumping	Oct. 31, 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		$ 117,000	$ 350,000	$ 911,000	$ 2,732,000

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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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