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Partners' Capital - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Limited Partners' Capital Account
Common limited partner units (in shares)	38,802,750
Cash distributions	$ 197	$ 2,457
Martin Resource Management Corporation \| Martin Resource Management
Limited Partners' Capital Account
Voting interest percentage	51.00%
Martin Resource Management
Limited Partners' Capital Account
Common limited partner units (in shares)	6,114,532
Voting interest percentage	15.80%
Martin Resource Management Corporation
Limited Partners' Capital Account
Ownership interest (percentage)	98.00%
Martin Resource Management Corporation \| Martin Resource Management Corporation
Limited Partners' Capital Account
Purchase price			$ 550,773
Cash distributions			$ 287,734
MMGP LLC
Limited Partners' Capital Account
General partner interest percentage	2.00%
MMGP LLC \| Martin Resource Management
Limited Partners' Capital Account
Ownership interest (percentage)	15.80%
General partner interest percentage	2.00%