CONSOLIDATED STATEMENTS OF PARTNERS' CAPITAL - USD ($) $ in Thousands	Total	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Limited Partners	Class B Units
Beginning balance at Dec. 31, 2012	$ 2,388,840	$ (158,779)	$ 16,527	$ 2,117,788	$ 413,304
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	164,425		4,152	143,554	16,719
Acquisition of additional interest in Buckeye Memphis	(9,727)		(1,495)	(8,232)
Distributions paid to unitholders	(428,829)		3,679	(432,508)
Conversion of Class B Units to LP Units	0			(430,023)	430,023
Net proceeds from issuance of LP Units	902,976			902,976
Amortization of unit-based compensation awards	21,781			21,781
Net proceeds from exercise of Unit options	1,277			1,277
Payment of tax withholding on issuance of LTIP awards	(5,034)			(5,034)
Distributions paid to noncontrolling interests	(7,850)		(7,850)
Other comprehensive income (loss)	55,227	55,227
Noncash accrual for distribution equivalent rights	(2,250)			(2,250)
Other	0		158	(158)
Ending balance at Dec. 31, 2013	3,080,836	(103,552)	15,171	3,169,217	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	274,857		1,903	272,954
Acquisition of additional interest in Buckeye Memphis	(9,510)		(1,577)	(7,933)
Noncontrolling interest in acquisition (Note 3)	208,998		208,998
Distributions paid to unitholders	(527,198)		3,178	(530,376)
Contributions from noncontrolling interests (Note 3)	16,400		16,400
Net proceeds from issuance of LP Units	899,710			899,710
Amortization of unit-based compensation awards	21,499			21,499
Net proceeds from exercise of Unit options	849			849
Payment of tax withholding on issuance of LTIP awards	(6,234)			(6,234)
Distributions paid to noncontrolling interests	(6,593)		(6,593)
Other comprehensive income (loss)	(11,736)	(11,736)
Noncash accrual for distribution equivalent rights	(1,619)			(1,619)
Other	337		488	(151)
Ending balance at Dec. 31, 2014	3,940,596	(115,288)	237,968	3,817,916	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net income	437,534		311	437,223
Acquisition of additional interest in Buckeye Memphis	(10,044)		(1,768)	(8,276)
Noncontrolling interest in acquisition (Note 3)	(1,220)		(1,220)
Distributions paid to unitholders	(590,971)		3,161	(594,132)
Contributions from noncontrolling interests (Note 3)	57,000		57,000
Net proceeds from issuance of LP Units	161,474			161,474
Amortization of unit-based compensation awards	29,332			29,332
Net proceeds from exercise of Unit options	215			215
Payment of tax withholding on issuance of LTIP awards	(7,700)			(7,700)
Distributions paid to noncontrolling interests	(13,972)		(13,972)
Other comprehensive income (loss)	17,447	17,447
Noncash accrual for distribution equivalent rights	(3,085)			(3,085)
Other	135		(128)	263
Ending balance at Dec. 31, 2015	$ 4,016,741	$ (97,841)	$ 281,352	$ 3,833,230	$ 0