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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 02, 2020
Jun. 30, 2019
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol PLPC    
Entity Registrant Name PREFORMED LINE PRODUCTS CO    
Entity Central Index Key 0000080035    
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 Small Business false    
Entity Emerging Growth Company false    
Entity Shell company false    
Entity Common Stock, Shares Outstanding   5,023,812  
Entity Public Float     $ 135,299,054
Entity File Number 0-31164    
Entity Tax Identification Number 34-0676895    
Entity Address, Address Line One 660 Beta Drive    
Entity Address, City or Town Mayfield Village    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44143    
City Area Code 440    
Local Phone Number 4615200    
Document Annual Report true    
Title of 12(b) Security Common Shares, $2 par value per share    
Security Exchange Name NASDAQ    
Entity Incorporation, State or Country Code OH    
Entity Interactive Data Current Yes    
Documents Incorporated by Reference

Portions of the Definitive Proxy Statement for the Annual Meeting of Shareholders to be held May 5, 2020 are incorporated by reference into Part III, Items 10, 11, 12, 13 and 14.