Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jul. 28, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	45,900	59,000	95,400	95,100
Share repurchase amount (no more than)					$ 100,000
Stock repurchased during period (in shares)	90,832	0	198,532	0
Stock repurchase average price (in dollars per share)	$ 127.41		$ 121.45
Decrease in weighted average shares outstanding, treasury stock (in shares)	59,256		99,421
Accounting Standards Update 2016-09
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excess tax benefit	$ 3,394,000		$ 7,524,000
Increase in diluted weighted shares outstanding (in shares)	238,917		210,776
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	6,400	11,000	23,200	31,300
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	200	0	8,100	6,400