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Acquisitions (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Aug. 05, 2013
May 06, 2013
Dec. 31, 2014
Acquisition          
Revolver borrowings $ (13,000)us-gaap_ProceedsFromRepaymentsOfLinesOfCredit $ 13,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit      
Allocation of the purchase price paid to the fair value of the net assets for acquisition          
Goodwill 160,962us-gaap_Goodwill 113,132us-gaap_Goodwill     160,962us-gaap_Goodwill
Trynex          
Acquisition          
Total consideration       26,734us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Working capital adjustment (262)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
       
Transaction expenses related to acquisition       1,239us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Contingent consideration in the form of an earnout capped       7,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Fair value of the contingent consideration recognized     3,587plow_BusinessAcquisitionFairValueOfContingentConsiderationRecognized
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
   
Allocation of the purchase price paid to the fair value of the net assets for acquisition          
Accounts receivable       604us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Inventories       4,130us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Other current assets       29us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Property and equipment       5,272us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Goodwill       5,910us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Intangible assets       12,499us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Accounts payable and other liabilities       (1,972)plow_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Total       26,472us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Business Acquisition, Pro Forma Information [Abstract]          
Revenues since acquisition 12,879us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
       
Pre-tax operating income (losses) since acquisition (3,334)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
       
Purchase accounting expenses 4,506plow_BusinessAcquisitionPurchaseAccountingExpenses
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
       
Trynex | Revolving credit facility          
Acquisition          
Revolver borrowings       28,000us-gaap_ProceedsFromRepaymentsOfLinesOfCredit
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
 
Henderson          
Acquisition          
Total consideration         98,676us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Payable to former shareholder         3,340us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Transaction expenses related to acquisition 1,815us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      1,815us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Allocation of the purchase price paid to the fair value of the net assets for acquisition          
Cash and cash equivalents 3,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      3,950us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Accounts receivable 14,951us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      14,951us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Inventories 16,308us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      16,308us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Refundable income taxes paid 1,149us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      1,149us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Deferred income taxes, current 514us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      514us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsCurrent
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Other current assets 876us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      876us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Property and equipment 10,848us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      10,848us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Goodwill 47,830us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      47,830us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Intangible assets 17,390us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      17,390us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Other assets, long-term 74us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      74us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Accounts payable and other liabilities (24,083)plow_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      (24,083)plow_BusinessAcquisitionPurchasePriceAllocationAccountsPayableAndOtherLiabilities
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Deferred income taxes, long-term (2,866)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      (2,866)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Other liabilities, long-term (248)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      (248)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Total 86,693us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
      86,693us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
Business Acquisition, Pro Forma Information [Abstract]          
Net sales 385,138us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
267,300us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
     
Net income 43,191us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
12,453us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
     
Earnings per common share assuming dilution attributable to common shareholders $ 1.90us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
$ 0.54us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
     
Henderson | Subsequent          
Acquisition          
Working capital adjustment         $ 4,688us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
/ us-gaap_StatementScenarioAxis
= us-gaap_SubsequentEventMember