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Fair Value Measurements - Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Jul. 14, 2016
Dec. 31, 2015
Apr. 01, 2015
Goodwill $ 107,187 $ 105,732   $ 41,327  
Deferred tax liability $ (985) $ (638)      
Wyoming Refining Company          
Net working capital     $ (11,092)    
Goodwill     66,449    
Long-term debt     (68,136)    
Other non-current liabilities     (32,222)    
Total     209,366    
Wyoming Refining Company | Property, Plant and Equipment          
Property, plant and equipment     $ 254,367    
Mid Pac Petroleum, LLC          
Net working capital         $ 15,989
Goodwill         26,942
Intangible assets         33,647
Other non-current assets         1,228
Deferred tax liability         (16,759)
Other non-current liabilities         (7,235)
Total         129,609
Mid Pac Petroleum, LLC | Property, Plant and Equipment          
Property, plant and equipment         40,997
Mid Pac Petroleum, LLC | Land          
Property, plant and equipment         $ 34,800