CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
NET INCOME (LOSS)	$ 579,148	$ 178,755	$ (129,051)
OTHER COMPREHENSIVE INCOME (LOSS):
Total recognized in accumulated other comprehensive loss	23,175	23,445	(9,681)
OTHER COMPREHENSIVE INCOME (LOSS)	23,175	23,445	(9,681)
COMPREHENSIVE INCOME (LOSS)	602,323	202,200	(138,732)
Less: Comprehensive income attributable to noncontrolling interest	(1,958)	(598)	(169)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP	600,365	201,602	(138,901)
Defined benefit pension plan
OTHER COMPREHENSIVE INCOME (LOSS):
Amortization of prior service cost (1)	186	186	186
Net actuarial gain	10,148	14,921	(5,522)
Amortization of net actuarial loss (gain) (1)	1,963	4,327	4,128
Total recognized in accumulated other comprehensive loss	12,297	19,434	(1,208)
Pneumoconiosis benefits
OTHER COMPREHENSIVE INCOME (LOSS):
Net actuarial gain	9,840	(161)	(7,787)
Amortization of net actuarial loss (gain) (1)	1,038	4,172	(686)
Total recognized in accumulated other comprehensive loss	$ 10,878	$ 4,011	$ (8,473)