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Parent Company Condensed Balance Sheets (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
ASSETS        
Cash and cash equivalents $ 61,135,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 95,390,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 139,855,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 153,784,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Property, plant and equipment, net 159,644,000us-gaap_PropertyPlantAndEquipmentNet 219,256,000us-gaap_PropertyPlantAndEquipmentNet    
Other non-current assets 62,283,000us-gaap_OtherAssetsNoncurrent 69,130,000us-gaap_OtherAssetsNoncurrent    
Total Assets 770,520,000us-gaap_Assets 809,956,000us-gaap_Assets 776,306,000us-gaap_Assets  
LIABILITIES AND EQUITY        
Current liabilities 254,681,000us-gaap_LiabilitiesCurrent 238,119,000us-gaap_LiabilitiesCurrent    
Other long-term liabilities 64,919,000us-gaap_OtherLiabilitiesNoncurrent 59,428,000us-gaap_OtherLiabilitiesNoncurrent    
Stockholders’ equity 211,474,000us-gaap_StockholdersEquity 297,780,000us-gaap_StockholdersEquity    
Total Liabilities and Stockholders’ Equity 770,520,000us-gaap_LiabilitiesAndStockholdersEquity 809,956,000us-gaap_LiabilitiesAndStockholdersEquity    
Parent Company        
ASSETS        
Cash and cash equivalents 53,415,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
94,035,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
120,659,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
130,676,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Other current assets 1,570,000us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
946,000us-gaap_OtherAssetsCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Investment in subsidiaries 197,981,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
242,184,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Property, plant and equipment, net 1,253,000us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
1,477,000us-gaap_PropertyPlantAndEquipmentNet
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other non-current assets 8,078,000us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
5,707,000us-gaap_OtherAssetsNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Assets 262,297,000us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
344,349,000us-gaap_Assets
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
LIABILITIES AND EQUITY        
Current liabilities 7,636,000us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
12,750,000us-gaap_LiabilitiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Current intercompany accounts payable, net 9,756,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
304,000us-gaap_AccountsPayableRelatedPartiesCurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Other long-term liabilities 14,732,000us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
13,065,000us-gaap_OtherLiabilitiesNoncurrent
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Stockholders’ equity 211,473,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
297,780,000us-gaap_StockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
Total Liabilities and Stockholders’ Equity 262,297,000us-gaap_LiabilitiesAndStockholdersEquity
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
344,349,000us-gaap_LiabilitiesAndStockholdersEquity
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Restricted investments 186,800,000nacco_InvestmentsInSubsidiariesRestrictedInvestment
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= us-gaap_ParentCompanyMember
     
Unrestricted investment 500,000nacco_InvestmentsInSubsidiariesUnrestrictedInvestment
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= us-gaap_ParentCompanyMember
     
HBB | Parent Company        
ASSETS        
Investment in subsidiaries 49,613,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nacco_HbbMember
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52,265,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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= nacco_HbbMember
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
   
KC | Parent Company        
ASSETS        
Investment in subsidiaries 32,170,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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36,772,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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= nacco_KcMember
/ dei_LegalEntityAxis
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NACoal | Parent Company        
ASSETS        
Investment in subsidiaries 103,056,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nacco_NacoalMember
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138,355,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nacco_NacoalMember
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= us-gaap_ParentCompanyMember
   
Other | Parent Company        
ASSETS        
Investment in subsidiaries 13,142,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_InvestmentsInAndAdvancesToAffiliatesCategorizationAxis
= nacco_OtherSubsidiariesMember
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14,792,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
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= nacco_OtherSubsidiariesMember
/ dei_LegalEntityAxis
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Bellaire | Parent Company        
LIABILITIES AND EQUITY        
Note payable to Bellaire $ 18,700,000us-gaap_NotesPayable
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= us-gaap_ParentCompanyMember
$ 20,450,000us-gaap_NotesPayable
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= us-gaap_ParentCompanyMember