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Line of Credit (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Line of Credit Facility [Line Items]  
Credit facility with a bank 40us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Credit Facility [Member]  
Line of Credit Facility [Line Items]  
Description of interest rate of credit facility LIBOR
Line of credit interest rate (in percent) 0.629%rgr_LineOfCreditFacilityReferenceRatePercentage
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Line of credit basis points 2.00%rgr_LineOfCreditFacilityBasisSpreadOnVariableRate
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Line of credit unused portion per year (in percent) 0.375%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= us-gaap_LineOfCreditMember
Revolving credit facility, expiration date Jun. 15, 2014