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Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | May 05, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Stock repurchased during period, value | $ 9,654,000 | $ 23,637,000 | $ 37,884,000 | $ 25,921,000 |
Decrease in weighted average number of shares outstanding treasury stock (in shares) | (22,842) |  | (155,372) |  |
2019 Program |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Share repurchase authorized amount |  |  |  |  | $ 125,000,000
2020 Program |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Share repurchase authorized amount |  |  |  |  | 200,000,000
Stock repurchased during period (in shares) | 61,472 |  | 301,660 |  |
Stock repurchase average price (in dollars per share) | $ 157.01 |  | $ 125.58 |  |
Remaining repurchase amount | $ 246,000,000 |  | $ 246,000,000 |  |
Share Repurchase Program 2018 |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |
Share repurchase authorized amount |  |  |  |  | $ 125,000,000

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