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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Revenue from Contract with Customer [Abstract] |  |  |  |
Primary term of contract |  |  | 5 years |
Performance obligations satisfied in prior period, amount recognized | $ 0.0 | $ 0.0 | $ 2.1 | $ 0.0
Revenue recognized in contract liability | 0.3 | $ 0.3 | 0.5 | $ 0.5
Contract assets recognized | $ 0.0 |  | $ 0.0 |

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- Definition Contract With Customer, Variable Consideration From Uncertainty Of Collectability, Performance Obligation Satisfied in Previous Period + References No definition available. + Details
Name: | nacco_ContractWithCustomerVariableConsiderationFromUncertaintyOfCollectabilityPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix: | nacco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Performance Obligation, Contract Term + References No definition available. + Details
Name: | nacco_PerformanceObligationContractTerm
Namespace Prefix: | nacco_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054 + Details
Name: | us-gaap_CapitalizedContractCostNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration