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Warranty Liability (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Warranty liability      
Period of warranty history used in estimating warranty costs 5 years    
Company's warranty liability:      
Balance at the beginning of the period $ 3,808us-gaap_StandardProductWarrantyAccrualCurrent $ 3,628us-gaap_StandardProductWarrantyAccrualCurrent $ 4,188us-gaap_StandardProductWarrantyAccrualCurrent
Warranty provision 4,574us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 1,452us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 846us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Claims paid/settlements (2,800)us-gaap_StandardProductWarrantyAccrualPayments (1,872)us-gaap_StandardProductWarrantyAccrualPayments (1,406)us-gaap_StandardProductWarrantyAccrualPayments
Balance at the end of the period 6,279us-gaap_StandardProductWarrantyAccrualCurrent 3,808us-gaap_StandardProductWarrantyAccrualCurrent 3,628us-gaap_StandardProductWarrantyAccrualCurrent
Henderson      
Company's warranty liability:      
Establish warranty provision for acquisitions 697us-gaap_StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition
/ us-gaap_BusinessAcquisitionAxis
= plow_HendersonInc.Member
   
Trynex      
Company's warranty liability:      
Establish warranty provision for acquisitions   $ 600us-gaap_StandardProductWarrantyAccrualAdditionsFromBusinessAcquisition
/ us-gaap_BusinessAcquisitionAxis
= plow_TrynexIncMember
 
Snow and ice control equipment      
Warranty liability      
Warranty period 2 years    
Parts and accessories      
Warranty liability      
Warranty period 1 year    
Certain snowplows      
Warranty liability      
Warranty period 1 year