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Inventory - Schedule of Inventory (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
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Inventory Disclosure [Abstract] |  |
Equipment and materials | $ 9,857 | $ 14,225
Crude oil inventory | 7,812 | 7,129
Total inventory | $ 17,669 | $ 21,354

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