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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 14, 2020
Jun. 30, 2019
Document and Entity Information [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2019    
Entity File Number 0-4776    
Entity Registrant Name STURM, RUGER & COMPANY, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 06-0633559    
Entity Address, Address Line One 1 Lacey Place    
Entity Address, City or Town Southport    
Entity Address, State or Province CT    
Entity Address, Postal Zip Code 06890    
City Area Code 203    
Local Phone Number 259-7843    
Title of 12(b) Security Common Stock, $1 par value    
Trading Symbol RGR    
Name of Exchange on which Security is Registered NYSE    
Entity Well-Known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 928,739,700
Entity Common Stock, Shares Outstanding   17,452,000  
Documents Incorporated By Reference Text Block

Portions of the registrant’s Proxy Statement relating to the 2020 Annual Meeting of Stockholders to be held May 13, 2020 are incorporated by reference into Part III (Items 10 through 14) of this Report.

   
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000095029    
Current Fiscal Year End Date --12-31