Segment Reporting - Summary of Percentage of Revenues from Major Customers (Detail) - Net sales	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
General Motors
Revenue, Major Customer [Line Items]
Concentration risk percentage	18.10%	18.00%	20.90%
Ford
Revenue, Major Customer [Line Items]
Concentration risk percentage	15.60%	18.30%	21.00%
BMW
Revenue, Major Customer [Line Items]
Concentration risk percentage	6.90%	8.10%	10.10%

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
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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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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