Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards
Income Tax Expense (Benefit)	$ 5,918	$ 7,927	$ 3,380
Cash paid for income taxes	1,404	2,250	1,232
Income taxes payable	652	665
Difference between partnership's tax basis and reported amounts	124,695	112,841
Martin Transportation Inc
Operating Loss Carryforwards
Income Tax Expense (Benefit)	5,478	7,431	3,080
State
Operating Loss Carryforwards
Income taxes payable	567	451
MTI
Operating Loss Carryforwards
Income Tax Expense (Benefit)	5,478	7,431	3,080
Net operating loss carryforwards	10,680
Net operating loss carryforwards, subject to expiration	4,797
Net operating loss carryforwards, not subject to expiration	5,883
MTI | Federal
Operating Loss Carryforwards
Income taxes refundable	29	374
MTI | State
Operating Loss Carryforwards
Income taxes refundable	85	214
Texas
Operating Loss Carryforwards
State income taxes	$ 440	$ 496	$ 300