Consolidated Condensed Statements of Income (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
Income Statement [Abstract]
Product revenues	$ 206,012	$ 171,182	$ 606,132	$ 479,792
Cost of sales	144,427	125,265	426,765	354,672
Gross margin	61,585	45,917	179,367	125,120
Operating expenses:
Net research and development expenses	15,278	12,718	42,873	36,962
Acquisition transaction expenses		326	1,075	1,911
Selling, general and administrative	22,307	18,319	62,368	53,483
Total operating expenses	37,585	31,363	106,316	92,356
Operating income	24,000	14,554	73,051	32,764
Interest expense	(857)	(1,062)	(2,758)	(2,916)
Debt retirement expense	(730)		(730)
Revaluation of derivatives	294	217	(293)	1,201
Foreign currency gain(loss)	938	(1,612)	(905)	(1,514)
Gain realized from step acquisition of subsidiary			785
Income from equity investment		77		319
Other income	495	191	796	691
Earnings before income tax	24,140	12,365	69,946	30,545
Income tax expense	6,852	3,600	19,656	6,343
Net income	17,288	8,765	50,290	24,202
Income attributable to non-controlling interest		(63)		(1,340)
Net income attributable to Gentherm Incorporated	17,288	8,702	50,290	22,862
Convertible preferred stock dividends		(159)		(1,622)
Net income attributable to common shareholders	$ 17,288	$ 8,543	$ 50,290	$ 21,240
Basic earnings per share	$ 0.49	$ 0.25	$ 1.42	$ 0.64
Diluted earnings per share	$ 0.48	$ 0.24	$ 1.40	$ 0.63
Weighted average number of shares – basic	35,522,407	34,447,098	35,317,359	33,261,115
Weighted average number of shares – diluted	36,271,280	34,886,462	35,942,811	33,584,226