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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Advertising expenses $ 3.6us-gaap_AdvertisingExpense $ 3.2us-gaap_AdvertisingExpense $ 3.4us-gaap_AdvertisingExpense
Shipping costs 7.1us-gaap_ShippingHandlingAndTransportationCosts 6.8us-gaap_ShippingHandlingAndTransportationCosts 5.6us-gaap_ShippingHandlingAndTransportationCosts
Research and development $ 10.0us-gaap_ResearchAndDevelopmentExpense $ 6.2us-gaap_ResearchAndDevelopmentExpense $ 5.9us-gaap_ResearchAndDevelopmentExpense
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 15 years    
Machinery and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 7 years    
Tools and dies [Member]      
Property, Plant and Equipment [Line Items]      
Useful life 3 years    
Net castings sales [Member]      
Segment Reporting Information [Line Items]      
Percentage of sales 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= rgr_UnaffiliatedCastingsMember
   
Export firearm sales [Member]      
Segment Reporting Information [Line Items]      
Percentage of sales 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementBusinessSegmentsAxis
= rgr_ExportSalesMember