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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2017
Feb. 21, 2018
Jul. 02, 2017
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol BGFV    
Entity Registrant Name BIG 5 SPORTING GOODS CORP    
Entity Central Index Key 0001156388    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   21,271,821  
Entity Public Float     $ 176,236,713