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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
A reconciliation of the beginning and ending aggregate carrying amount of the asset retirement obligations are as follows:
 
NACoal
 
Bellaire
 
NACCO
Consolidated
Balance at January 1, 2013
$
15,070

 
$
16,416

 
$
31,486

Liabilities settled during the period
(316
)
 
(1,243
)
 
(1,559
)
Accretion expense
735

 
1,161

 
1,896

Revision of estimated cash flows
—

 
592

 
592

Balance at December 31, 2013
$
15,489

 
$
16,926

 
$
32,415

Liabilities acquired during the period
7,297

 
—

 
7,297

Liabilities settled during the period
(381
)
 
(1,128
)
 
(1,509
)
Accretion expense
379

 
1,183

 
1,562

Revision of estimated cash flows
1,448

 
606

 
2,054

Balance at December 31, 2014
$
24,232

 
$
17,587

 
$
41,819