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Acquisitions - Unaudited Pro Forma Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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 $ 3,361,739
Net loss   $ (54,941) $ (28,501)