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Acquisition (Details) (USD $)
3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 16, 2014
Recognized identified assets acquired and liabilities assumed                        
Goodwill $ 6,253,000us-gaap_Goodwill       $ 0us-gaap_Goodwill       $ 6,253,000us-gaap_Goodwill $ 0us-gaap_Goodwill    
Results of National Coal of Alabama included in the Company's Consolidated Statements of Operations                        
Revenues 297,285,000us-gaap_Revenues 221,714,000us-gaap_Revenues 200,370,000us-gaap_Revenues 177,413,000us-gaap_Revenues 311,983,000us-gaap_Revenues 228,614,000us-gaap_Revenues 196,017,000us-gaap_Revenues 196,052,000us-gaap_Revenues 896,782,000us-gaap_Revenues 932,666,000us-gaap_Revenues 873,364,000us-gaap_Revenues  
Operating profit (73,156,000)us-gaap_OperatingIncomeLoss 11,323,000us-gaap_OperatingIncomeLoss (3,891,000)us-gaap_OperatingIncomeLoss (585,000)us-gaap_OperatingIncomeLoss 28,829,000us-gaap_OperatingIncomeLoss 16,682,000us-gaap_OperatingIncomeLoss 8,803,000us-gaap_OperatingIncomeLoss 7,022,000us-gaap_OperatingIncomeLoss (66,309,000)us-gaap_OperatingIncomeLoss 61,336,000us-gaap_OperatingIncomeLoss 67,642,000us-gaap_OperatingIncomeLoss  
Weston Products, LLC                        
Business Acquisition [Line Items]                        
Purchase consideration                       25,400,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
Cash paid at closing                       25,000,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
Net working capital and EBITDA adjustment                       400,000nacco_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNetWorkingCapitalandEBITDAAdjustment
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
Acquisition related costs                 400,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Recognized identified assets acquired and liabilities assumed                        
Accounts receivable 6,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              6,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Inventory 5,113,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              5,113,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Other current assets 658,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              658,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Property, plant and equipment (including mineral rights) 590,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              590,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Intangible assets 10,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              10,100,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Total assets acquired 22,561,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              22,561,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Other current liabilities 3,367,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              3,367,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Total liabilities assumed 3,367,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              3,367,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Net assets acquired 19,194,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              19,194,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Purchase price 25,447,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              25,447,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Goodwill 6,253,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
              6,253,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Results of National Coal of Alabama included in the Company's Consolidated Statements of Operations                        
Revenues                 1,102,000us-gaap_Revenues
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
Operating profit                 (193,000)us-gaap_OperatingIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nacco_WestonProductsLLCMember
     
National Coal of Alabama, Inc.                        
Business Acquisition [Line Items]                        
Liabilities incurred                   9,700,000us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
   
Other noncurrent assets         3,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
        3,300,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
   
Other noncurrent liabilities         12,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
        12,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
   
Reclamation obligations         7,300,000nacco_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedReclamationObligations
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
        7,300,000nacco_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedReclamationObligations
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
   
Acquisition cost                 100,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
300,000us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAdditionalDisclosuresAcquisitionCostExpensed
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
   
Recognized identified assets acquired and liabilities assumed                        
Inventory         $ 16,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member
        $ 16,600,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= nacco_NationalCoalofAlabamaInc.Member