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Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	[1]	Jun. 30, 2018	[1]	Mar. 31, 2018	[1]	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Product revenues	$ 230,381	$ 240,056	$ 243,326	$ 257,921	$ 256,015		$ 261,504		$ 266,400		$ 264,586		$ 971,684	$ 1,048,505	$ 993,991
Automotive Segments
Segment Reporting Information [Line Items]
Product revenues													920,225	957,824	886,600
Automotive Segments | Climate Control Seat (CCS)
Segment Reporting Information [Line Items]
Product revenues													359,355	373,945	387,961
Automotive Segments | Seat Heaters
Segment Reporting Information [Line Items]
Product revenues													284,174	305,337	307,308
Automotive Segments | Automotive Cables
Segment Reporting Information [Line Items]
Product revenues													88,031	98,931	92,092
Automotive Segments | Steering Wheel Heaters
Segment Reporting Information [Line Items]
Product revenues													65,426	69,845	62,125
Automotive Segments | Electronics
Segment Reporting Information [Line Items]
Product revenues													47,542	56,783	8,816
Automotive Segments | Battery Thermal Management (BTM)
Segment Reporting Information [Line Items]
Product revenues													41,498	28,472	10,046
Automotive Segments | Other Automotive
Segment Reporting Information [Line Items]
Product revenues													34,199	24,511	18,252
Industrial Segments
Segment Reporting Information [Line Items]
Product revenues													51,459	90,681	107,391
Industrial Segments | Medical
Segment Reporting Information [Line Items]
Product revenues													36,860	30,108	30,375
Industrial Segments | GPT
Segment Reporting Information [Line Items]
Product revenues													11,181	19,520	32,282
Industrial Segments | CSZ-IC
Segment Reporting Information [Line Items]
Product revenues													$ 3,418	$ 41,053	$ 44,734
[1] Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses.  See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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