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Other Operating (Income) Expenses, net (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Operating (Income) Expenses, net [Abstract] |  |  |
Gain on sale of operating assets | $ (1)us-gaap_GainLossOnSaleOfOtherAssets | $ (65)us-gaap_GainLossOnSaleOfOtherAssets | $ (27)us-gaap_GainLossOnSaleOfOtherAssets
Frozen defined-benefit pension plan (income) expense | (1,611)rgr_DefinedBenefitPensionPlanExpenseIncome | (336)rgr_DefinedBenefitPensionPlanExpenseIncome | 320 rgr_DefinedBenefitPensionPlanExpenseIncome
Total other operating (income) expenses, net | $ (1,612)us-gaap_OtherOperatingIncomeExpenseNet | $ (401)us-gaap_OtherOperatingIncomeExpenseNet | $ 293 us-gaap_OtherOperatingIncomeExpenseNet

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- Definition Defined Benefit Pension Plan Expense Income + References No definition available. + Details
Name: | rgr_DefinedBenefitPensionPlanExpenseIncome
Namespace Prefix: | rgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnSaleOfOtherAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
Name: | us-gaap_OtherOperatingIncomeExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration