Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Export Sales	$ 49.7	$ 47.0	$ 40.7
Percentage Of Sales To Automotive Market	65.50%	62.00%	57.00%
Percentage Of Foreign And Export Sales	46.70%	49.90%	50.70%
Percentage Of Accounts Receivable From Significant Customer	17.00%	14.50%
Proceeds from Customers for Progress Payments	4.6	2.7
Finite-Lived Intangible Asset, Useful Life	6 years
Research and Development Expense	7.7	8.1	8.5
Certificate of deposit included in short-term investment		$ 12.0
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	20 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	4 years
Ford Motor Company [Member]
Percentage Of Foreign And Export Sales	18.80%	16.20%	11.10%
Chrysler Group Llc [Member]
Percentage Of Foreign And Export Sales	10.00%

A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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