CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance		$ 260,417		$ 357,962	$ 260,417	$ 357,962	$ 337,187
Net income (loss)	4,374	11,795	(39,259)	16,636	(11,705)	(13,354)	101,987
Issuance of common units					331,728		194,170
General partner contribution					7,007	37	4,145
Purchase of treasury units					(277)	(250)	(222)
Cash distributions					(97,368)	(84,588)	(76,528)
Excess purchase price over carrying value of acquired assets					4,948	301	142,075
Excess carrying value of the assets over the purchase price paid by Martin Resource Management							(4,268)
Contributions to parent							(56,193)
Adjustment in fair value of derivatives							(626)
Unit-based compensation					817	911	385
Ending Balance	485,671		260,417		485,671	260,417	357,962
Limited Partner [Member] | Common [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance (in units)		26,625,026		26,566,776	26,625,026	26,566,776	20,471,776
Beginning Balance		254,028		349,490	254,028	349,490	279,562
Net income (loss)					(15,208)	(13,087)	92,617
Issuance of common units (in units)					8,743,386		6,095,000
Issuance of common units					331,728		194,170
Issuance of restricted units (in units)					8,900	64,500	6,250
Forfeiture of restricted units (in units)					(5,000)	(250)
Purchase of treasury units (in units)					(6,400)	(6,000)	(6,250)
Purchase of treasury units					(277)	(250)	(222)
Cash distributions					(95,197)	(82,735)	(70,679)
Excess purchase price over carrying value of acquired assets					4,948	301	142,075
Excess carrying value of the assets over the purchase price paid by Martin Resource Management							(4,268)
Unit-based compensation					817	911	385
Ending Balance	470,943		254,028		470,943	254,028	349,490
Ending Balance (in units)	35,365,912		26,625,026		35,365,912	26,625,026	26,566,776
General Partner [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance		6,389		8,472	6,389	8,472	5,428
Net income (loss)					3,503	(267)	4,748
General partner contribution					7,007	37	4,145
Cash distributions					(2,171)	(1,853)	(5,849)
Ending Balance	14,728		6,389		14,728	6,389	8,472
Accumulated Comprehensive Income
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance								626
Ending Balance	0		0		0	0	0	626
Parent Net Investment
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning Balance				0		0	51,571
Net income (loss)						0	4,622
Contributions to parent							(56,193)
Ending Balance	$ 0		$ 0		$ 0	$ 0	$ 0