Percentage of Total Product Revenues Generated from Customers (Detail)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total product revenues in percentage	100.00%	100.00%	100.00%
Lear \| Sales Revenue, Net \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	17.00%	20.00%	21.00%
Adient \| Sales Revenue, Net \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	16.00%	18.00%	21.00%
Bosch \| Sales Revenue, Net \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Total product revenues in percentage	8.00%	8.00%	8.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
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-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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