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Contingent Liabilities (Schedule of Product Liability Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product Liability Contingency [Line Items]      
Total Product Liability Expense $ 774us-gaap_ProductLiabilityAccrualPeriodExpense $ 1,253us-gaap_ProductLiabilityAccrualPeriodExpense $ 177us-gaap_ProductLiabilityAccrualPeriodExpense
Accrued Legal Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense (295)us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_AccruedLegalExpenseMember		 [1] 230us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_AccruedLegalExpenseMember		 [1] (633)us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_AccruedLegalExpenseMember		 [1]
Insurance Premium Expense [Member]      
Product Liability Contingency [Line Items]      
Total Product Liability Expense $ 1,069us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_ProductInsurancePremiumExpenseMember		 [2] $ 1,023us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_ProductInsurancePremiumExpenseMember		 [2] $ 810us-gaap_ProductLiabilityAccrualPeriodExpense
/ us-gaap_ProductOrServiceAxis
= rgr_ProductInsurancePremiumExpenseMember		 [2]
[1] The expense accrued in the liability is for legal fees only. In 2012, the costs incurred related to cases that were settled or dismissed were less than the amounts accrued for these cases in prior years.
[2] Insurance expense represents the cost of insurance premiums.