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Acquisitions - Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Wyoming Refining Company |  |
Business Acquisition [Line Items] |  |
Revenues | $ 2,026,237 | $ 2,369,513
Net loss | $ (51,239) | $ (51,582)
Earnings Per Share [Abstract] |  |
Basic (in dollars per share) | $ (1.21) | $ (1.24)
Diluted (in dollars per share) | $ (1.21) | $ (1.24)
Mid Pac Petroleum, LLC |  |
Business Acquisition [Line Items] |  |
Revenues |  | $ 2,093,587
Net loss |  | $ (54,941)

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