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Revenue Recognition and Contracts with Customers (Schedule of Revenue Recognized) (Details) $ in Thousands	12 Months Ended
	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: