Line of Credit (Details) (USD $) In Thousands, unless otherwise specified	1 Months Ended
Feb. 28, 2013	Dec. 31, 2007
Line of Credit Facility [Line Items]
Credit facility with a bank	$ 40,000	$ 25,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Description of interest rate of credit facility		LIBOR
Line of credit interest rate (in percent)		0.583%
Line of credit basis points		2.00%
Line of credit unused portion per year (in percent)		0.375%
Revolving credit facility, expiration date	Jun. 15, 2014

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

Name:	rgr_LineOfCreditFacilityBasisSpreadOnVariableRate
Namespace Prefix:	rgr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate percentage at the end of the reporting period.

+ References

No definition available.

+ Details

Name:	rgr_LineOfCreditFacilityReferenceRatePercentage
Namespace Prefix:	rgr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration