BUSINESS SEGMENTS - Narrative (Details) bbl / d in Thousands, $ in Thousands, bbl in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2015 segment propane_storage	Dec. 31, 2014 USD ($)	Sep. 30, 2014 bbl / d dock facilitiy berth splitter	Dec. 31, 2015 USD ($) bbl / d segment dock facilitiy berth splitter terminal propane_storage bbl	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Segment Reporting Information [Line Items]
Number of business segments | segment	3			3
Number of condensate splitters | splitter				2
Capacity of condensate splitters (in barrels per day) | bbl / d				25
Proceeds from sale of business | $				$ (857)	$ 103,407	$ 0
Natural Gas Storage
Segment Reporting Information [Line Items]
Proceeds from sale of business | $		$ 102,600
Working capital adjustments related to sale of businesses | $		$ 2,400
Buckeye Texas
Segment Reporting Information [Line Items]
Number of vessel berths | berth			5	5
Number of docks | dock			3	3
Number of condensate splitters | splitter			2
Capacity of condensate splitters (in barrels per day) | bbl / d			25
Number of barrels of liquid petroleum products storage (in barrels) | bbl				6.0
Number of field gathering facilities | facilitiy			3	3
Domestic Pipelines & Terminals
Segment Reporting Information [Line Items]
Number of liquid petroleum products terminals operated | terminal				5
Domestic Pipelines & Terminals | Indiana and Illinois
Segment Reporting Information [Line Items]
Number of underground propane storage caverns | propane_storage	2			2
Global Marine Terminals
Segment Reporting Information [Line Items]
Number of liquid petroleum products terminals owned | terminal				7
Merchant Services
Segment Reporting Information [Line Items]
Number of liquid petroleum products terminals owned | terminal				5