Segment Reporting - Percentage of Total Product Revenues Generated from Customers (Detail) - Sales Revenue, Net - Customer Concentration Risk	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lear
Segment Reporting Information [Line Items]
Total product revenues in percentage	15.00%	16.00%	17.00%
Adient
Segment Reporting Information [Line Items]
Total product revenues in percentage	14.00%	15.00%	16.00%

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://www.xbrl.org/2003/role/disclosureRef
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