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EARNINGS PER UNIT (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share [Abstract]    
Net income attributable to Buckeye Partners, L.P. $ 131,113 $ 111,611
Basic:    
Weighted average units outstanding - basic (in shares) 129,703 127,175
Earnings per unit - basic (in dollars per share) $ 1.01 $ 0.88
Diluted:    
Weighted average units outstanding - basic (in shares) 129,703 127,175
Dilutive effect of LP Unit options and LTIP awards granted (in shares) 426 432
Weighted average units outstanding - diluted (in shares) 130,129 127,607
Earnings per unit - diluted (in dollars per share) $ 1.01 $ 0.87