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Contingent Liabilities (Schedule of Product Liability Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Product Liability Contingency [Line Items] |  |  |  |  |  |
Total Product Liability Expense | $ 774 us-gaap_ProductLiabilityAccrualPeriodExpense |  | $ 1,253 us-gaap_ProductLiabilityAccrualPeriodExpense |  | $ 177 us-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] | 230 us-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 | $ 1,069 us-gaap_ProductLiabilityAccrualPeriodExpense / us-gaap_ProductOrServiceAxis = rgr_ProductInsurancePremiumExpenseMember | [2] | $ 1,023 us-gaap_ProductLiabilityAccrualPeriodExpense / us-gaap_ProductOrServiceAxis = rgr_ProductInsurancePremiumExpenseMember | [2] | $ 810 us-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.

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- Definition The amount of loss reported during the period pertaining to product liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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- Details
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