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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Advertising expenses | $ 3.6 us-gaap_AdvertisingExpense | $ 3.2 us-gaap_AdvertisingExpense | $ 3.4 us-gaap_AdvertisingExpense
Shipping costs | 7.1 us-gaap_ShippingHandlingAndTransportationCosts | 6.8 us-gaap_ShippingHandlingAndTransportationCosts | 5.6 us-gaap_ShippingHandlingAndTransportationCosts
Research and development | $ 10.0 us-gaap_ResearchAndDevelopmentExpense | $ 6.2 us-gaap_ResearchAndDevelopmentExpense | $ 5.9 us-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 |  |

X
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18726-107790 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6408196&loc=d3e61069-111654 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Handling Costs -URI http://asc.fasb.org/extlink&oid=6514758 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21915142&loc=d3e60635-111653 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6408413&loc=d3e221937-122793 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Shipping Costs -URI http://asc.fasb.org/extlink&oid=6525344 + Details
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