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Schedule I - Condensed Financial Information of the Parent (Textual) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]        
Cash and cash equivalents $ 61,135,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 95,390,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 139,855,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 153,784,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Parent Company        
Condensed Financial Statements, Captions [Line Items]        
Unrestricted investment 500,000nacco_InvestmentsInSubsidiariesUnrestrictedInvestment
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		      
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