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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
A reconciliation of the Company's beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:
 
 
Coal Mining
 
NAMining
 
Unallocated Items
 
NACCO
Consolidated
Balance at January 1, 2018
 
$
22,589

 
$
1,085

 
$
16,423

 
$
40,097

Liabilities incurred during the period
 
—

 
189

 
—

 
189

Liabilities settled during the period
 
(920
)
 
—

 
(747
)
 
(1,667
)
Accretion expense
 
1,504

 
31

 
1,044

 
2,579

Revision of estimated cash flows
 
(2,777
)
 
(820
)
 
102

 
(3,495
)
Balance at December 31, 2018
 
$
20,396

 
$
485

 
$
16,822

 
$
37,703

Liabilities incurred during the period
 
—

 
91

 
—

 
91

Liabilities settled during the period
 
(8,265
)
 
—

 
(752
)
 
(9,017
)
Accretion expense
 
1,260

 
28

 
1,323

 
2,611

Revision of estimated cash flows at MLMC
 
3,145

 
—

 
—

 
3,145

Revision of estimated cash flows at Centennial
 
2,479

 
—

 
(153
)
 
2,326

Balance at December 31, 2019
 
$
19,015

 
$
604

 
$
17,240

 
$
36,859