PROPERTY, PLANT AND EQUIPMENT, NET - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 16, 2017	Jul. 01, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment acquired			$ 152,263	$ 66
Depreciation expense			15,181	12,726	$ 11,099
Repauno
Property, Plant and Equipment [Line Items]
Property, plant and equipment acquired		$ 24,000
Acquisition costs		$ 13,991
Hannibal
Property, Plant and Equipment [Line Items]
Property, plant and equipment acquired	$ 30,000
Acquisition costs	$ 2,335
Railroad equipment
Property, Plant and Equipment [Line Items]
Disposals of railroad equipment			$ 108	$ 490