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Business Acquisitions and Investments (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
		May 31, 2019	Apr. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Aug. 31, 2019	Mar. 31, 2018	Apr. 30, 2014
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract]
Net sales	[1]			$ 307,723	$ 296,619	$ 896,661	$ 845,081
Assets acquired and liabilities assumed [Abstract]
Goodwill				$ 77,664		$ 77,664		$ 67,321
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member]
Business Combination, Description [Abstract]
Percentage of equity interest acquired in joint venture				65.00%		65.00%				15.00%	50.00%
Investment in unconsolidated affiliates										$ 4,200	$ 14,000
Pollak business of Stoneridge, Inc. [Member]
Allocation of the Purchase Price, Assets Acquired and Liabilities Assumed [Abstract]
Acquisition of assets and liabilities			$ 40,000
Post-closing adjustments amount		$ 1,600
Net sales								$ 45,000
Purchase Price			38,427
Assets acquired and liabilities assumed [Abstract]
Inventory			3,331
Property, plant and equipment, net			45
Intangible assets			24,650
Goodwill			10,401
Net assets acquired			38,427
Estimated useful life of intangible assets						15 years
Revenues				$ 20,000
Pollak business of Stoneridge, Inc. [Member] | Customer Relationships [Member]
Assets acquired and liabilities assumed [Abstract]
Intangible assets			7,200
Estimated useful life of intangible assets						15 years
Pollak business of Stoneridge, Inc. [Member] | Trademarks [Member]
Assets acquired and liabilities assumed [Abstract]
Intangible assets			200
Estimated useful life of intangible assets						10 years
Pollak business of Stoneridge, Inc. [Member] | Non-Compete Agreements [Member]
Assets acquired and liabilities assumed [Abstract]
Intangible assets			100
Estimated useful life of intangible assets						5 years
Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member]
Assets acquired and liabilities assumed [Abstract]
Estimated useful life of intangible assets						10 years
Pollak business of Stoneridge, Inc. [Member] | OE/OES [Member] | Customer Relationships [Member]
Assets acquired and liabilities assumed [Abstract]
Intangible assets			$ 17,200
Estimated useful life of intangible assets						10 years
Jiangsu Che Yijia New Energy Technology Co., Ltd. [Member]
Business Combination, Description [Abstract]
Percentage of equity interest acquired in joint venture									29.00%
Investment in unconsolidated affiliates									$ 5,100
[1] Segment net sales include intersegment sales in our Engine Management and Temperature Control segments.

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