| Cover | Apr. 29, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Apr. 29, 2021 |
| Entity File Number | 0-31164 |
| Entity Registrant Name | Preformed Line Products Company |
| Entity Central Index Key | 0000080035 |
| Entity Tax Identification Number | 34-0676895 |
| Entity Incorporation, State or Country Code | OH |
| 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 | 461-5200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common |
| Trading Symbol | PLPC |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
