REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 704,845	$ 541,274	$ 2,249,204	$ 1,506,307
Revenue recognized			39,492
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	382,040	318,810	1,100,606	993,727
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	288,573	220,177	827,848	681,879
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	93,467	98,633	272,758	311,848
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	322,805	222,464	1,148,598	512,580
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	201,475	159,492	780,825	350,295
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 121,330	$ 62,972	$ 367,773	$ 162,285