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Revenue Recognition and Contracts with Customers (Schedule of Revenue Recognized) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Contract liabilities with customers beginning of period | $ 6,950
After Adjustment [Member] |
Contract liabilities with customers beginning of period | 6,950
Revenue recognized | (20,653)
Revenue deferred | 21,180
Contract liabilities with customers at December 31, 2018 | $ 7,477

X
- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References No definition available. + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in deferred revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenuePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of revenue recognized that was previously reported as deferred or unearned revenue. + References No definition available. + Details
Name: | us-gaap_DeferredRevenueRevenueRecognized1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | srt_RestatementAxis=rgr_AfterAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |