Summary of % of Revenues and A/R from Major Customers (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
TI Group Automotive Systems, LLC
Percentage of revenues from major customers	14.00%	16.00%
Percentage of accounts receivable balances	17	18
Cooper-Standard Holdings Inc.
Percentage of revenues from major customers	12.00%	10.00%
Percentage of accounts receivable balances	15	13
Parker-Hannifin Corporation
Percentage of revenues from major customers	10.00%	10.00%
Percentage of accounts receivable balances	15	12

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
-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 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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