| Document and Entity Information | Oct. 29, 2019 |
| Cover page. | |
| Amendment Flag | false |
| Entity Central Index Key | 0001111928 |
| Document Type | 8-K |
| Document Period End Date | Oct. 29, 2019 |
| Entity Registrant Name | IPG PHOTONICS CORP |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-33155 |
| Entity Tax Identification Number | 04-3444218 |
| Entity Address, Address Line One | 50 Old Webster Road |
| Entity Address, City or Town | Oxford |
| Entity Address, State or Province | MA |
| Entity Address, Postal Zip Code | 01540 |
| City Area Code | 508 |
| Local Phone Number | 373-1100 |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | IPGP |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
