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Summary of Purchase Price Allocation (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2010
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Sand and chemical inventory	$ 6,848
Supplies	312
Property and equipment	154,359
Deferred tax asset	8,514
Goodwill	67,575
Below-market pricing agreements	(23,200)
Total purchase price	241,308
Non-compete agreement
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	1,400
Customer relationships
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Intangible assets	$ 25,500

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The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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The amount of acquisition cost of a business combination allocated to merchandise inventory.

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Amount of deferred tax assets or liabilities for the differences between the values assigned and the tax bases of assets and liabilities in a business combination, net of any valuation allowance for deferred tax assets.

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Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

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