Segment Reporting - Summary of Percentage of Revenues from Major Customers (Detail) - Net sales	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
General Motors
Revenue, Major Customer [Line Items]
Concentration risk percentage	18.20%	18.10%	18.00%
Ford
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.80%	15.60%	18.30%
Daimler
Revenue, Major Customer [Line Items]
Concentration risk percentage	11.10%	9.90%	8.70%
Volkswagen
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.90%	9.60%	7.80%

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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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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