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BUSINESS SEGMENTS - Summary of Financial Information by Each Segment (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenue $ 840,167 $ 728,384 $ 796,783 $ 1,088,100 $ 1,245,994 $ 1,573,473 $ 1,808,951 $ 1,991,829 $ 3,453,434 $ 6,620,247 $ 5,054,101
Capital additions, net                 594,520 472,149 361,445
Non-cash increases (decreases) in accounts payable and accruals for capital expenditures                 27,500 (49,800) 23,300
Total assets 8,369,281       8,065,720       8,369,281 8,065,720  
Tangible long-lived assets 6,202,081       5,735,787       6,202,081 5,735,787  
International                      
Segment Reporting Information [Line Items]                      
Revenue                 337,984 341,105 219,110
Operating Segments                      
Segment Reporting Information [Line Items]                      
Capital additions, net                 594,520 471,369 361,252
Intersegment                      
Segment Reporting Information [Line Items]                      
Revenue                 (65,280) (71,721) (33,576)
Reconciling Items | Natural Gas Storage                      
Segment Reporting Information [Line Items]                      
Capital additions, net                 0 780 193
Domestic Pipelines & Terminals | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenue                 966,749 938,036 844,832
Capital additions, net                 218,283 221,850 154,667
Total assets 3,498,883       3,357,410       3,498,883 3,357,410  
Global Marine Terminals | Tangible long-lived assets | International | Geographic concentration                      
Segment Reporting Information [Line Items]                      
Tangible long-lived assets 1,506,200       1,520,800       1,506,200 1,520,800  
Global Marine Terminals | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenue                 514,301 395,306 252,270
Capital additions, net                 375,267 248,905 206,472
Total assets 4,500,705       4,239,792       4,500,705 4,239,792  
Merchant Services | Operating Segments                      
Segment Reporting Information [Line Items]                      
Revenue                 2,037,664 5,358,626 3,990,575
Capital additions, net                 970 614 $ 113
Total assets $ 369,693       $ 468,518       $ 369,693 $ 468,518