Fair Value Measurements and Financial Instruments Credit Risk (Details) (Accounts Receivable [Member], Credit Concentration Risk [Member])	Mar. 31, 2012	Dec. 31, 2011
Ford And Affiliates [Member]
Concentration Risk [Line Items]
Customer credit risk	24.00%	24.00%
Hyundai Mobis Company [Member]
Concentration Risk [Line Items]
Customer credit risk	11.00%	14.00%
Hyundia Motor Company [Member]
Concentration Risk [Line Items]
Customer credit risk	9.00%	10.00%

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/presentationRef

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