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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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