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EARNINGS PER LIMITED PARTNER UNIT - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss) attributable to ARLP	$ (129,220)	$ 399,414	$ 366,604
General partners' equity ownership			(1,560)
LIMITED PARTNERS	(129,220)	399,414	365,044
Distributions to participating securities		(4,254)	(5,114)
Undistributed earnings attributable to participating securities		(2,237)	(1,641)
Net income (loss) attributable to ARLP available to limited partners	$ (129,220)	$ 392,923	$ 358,289
Weighted-average limited partner units outstanding - basic and diluted	127,164,659	128,116,670	130,758,169
Earnings per limited partner unit - basic and diluted	$ (1.02)	$ 3.07	$ 2.74
Anti-dilutive under the treasury stock method (in units)	773,664	1,284,013	1,658,908
MGP | Intermediate Partnership
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Ownership percentage by general partners	1.0001%
MGP | Alliance Coal
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Ownership percentage by general partners	0.001%

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