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