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DOCUMENT AND ENTITY INFORMATION (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Feb. 28, 2015
Jun. 30, 2014
Document and Entity Information [Abstract]      
Entity Registrant Name STONERIDGE INC    
Entity Central Index Key 0001043337    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Trading Symbol sri    
Entity Common Stock Shares Outstanding   27,970,905dei_EntityCommonStockSharesOutstanding  
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2014    
Entity Well-Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 278.3dei_EntityPublicFloat