REVENUES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 802,671	$ 473,328	$ 1,544,359	$ 965,033
Revenue recognized			36,591
Marine Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	378,163	331,265	718,566	674,917
Marine Transportation [Member] | Inland Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	286,920	224,464	539,275	461,702
Marine Transportation [Member] | Coastal Transportation [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	91,243	106,801	179,291	213,215
Distribution and Services [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	424,508	142,063	825,793	290,116
Distribution and Services [Member] | Oil and Gas [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	304,859	93,699	579,350	190,803
Distribution and Services [Member] | Commercial and Industrial [Member]
Disaggregation of Revenue [Abstract]
Revenues by major source	$ 119,649	$ 48,364	$ 246,443	$ 99,313