Net Income Attributable To IPG Photonics Corporation Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation	$ 55,200	$ 42,338	$ 144,014	$ 119,185
Weighted average shares (shares)	52,088,000	51,495,000	52,060,000	51,474,000
Dilutive effect of common stock equivalents (shares)	704,000	872,000	720,000	872,000
Diluted weighted average common shares (shares)	52,792,000	52,367,000	52,780,000	52,346,000
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.06	$ 0.82	$ 2.77	$ 2.32
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.05	$ 0.81	$ 2.73	$ 2.28
Options excluded from computation of diluted weighted average common shares	30,000	31,000	61,000	210,000