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Acquisition (Narrative) (Details) (Weston Products, LLC, USD $)
In Millions, unless otherwise specified
0 Months Ended 3 Months Ended 12 Months Ended
Dec. 16, 2014
Mar. 31, 2015
Dec. 31, 2014
Weston Products, LLC
     
Business Acquisition [Line Items]      
Consideration paid at closing $ 25.4us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
   
Cash consideration 25.0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
   
EBITDA adjustment 0.4nacco_BusinessCombinationProvisionalInformationAdjustmentNetWorkingCapitalandEBITDAAdjustment
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
   
Acquisition related costs   $ 0.1us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
$ 0.4us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember