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Summary of Significant Accounting Policies - Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Equipment and materials	$ 11,669	$ 16,438
Crude oil inventory	8,983	4,269
Inventory, net	$ 20,652	$ 20,707

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Carrying amount as of the balance sheet date of petroleum or crude oil.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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-Glossary Inventory

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