Fair Value Measurements - Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Jul. 14, 2016	Dec. 31, 2015	Apr. 01, 2015	Dec. 31, 2014
Goodwill	$ 105,732		$ 41,327		$ 20,786
Deferred tax liability	$ (638)		$ 0
Wyoming Refining Company
Net working capital		$ (11,590)
Goodwill		64,994
Long-term debt		(68,136)
Other non-current liabilities		(30,269)
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