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Summary of Significant Accounting Policies and Basis of Presentation - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans [Member] USD ($) | Dec. 31, 2011 Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans [Member] USD ($) | Dec. 31, 2010 Stock options outstanding under the 1993,1997, 2006 and 2011 Stock Option Plans [Member] USD ($) | Dec. 31, 2012 Production Tooling [Member] USD ($) | Dec. 31, 2011 Production Tooling [Member] USD ($) | Dec. 31, 2012 W.E.T. | Dec. 31, 2011 W.E.T. | Feb. 15, 2013 Subsequent Event USD ($) | Feb. 15, 2013 Subsequent Event EUR (€) | Dec. 31, 2012 W.E.T. [Member] EUR (€) | Dec. 31, 2010 Former Subsidiary BSST Now Advanced Technology [Member] | Feb. 15, 2013 W.E.T. Bank of America credit facility Subsequent Event USD ($) | Feb. 15, 2013 W.E.T. Bank of America credit facility Subsequent Event EUR (€) | Sep. 14, 2012 Intellectual Property USD ($) | Dec. 31, 2012 Intellectual Property USD ($) | Dec. 31, 2012 Patents [Member] USD ($) | Dec. 31, 2012 Minimum [Member] | Dec. 31, 2012 Minimum [Member] W.E.T. [Member] | Dec. 31, 2012 Minimum [Member] Patents [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Maximum [Member] Patents [Member] | Dec. 31, 2012 Lear [Member] | Dec. 31, 2011 Lear [Member] | Dec. 31, 2012 JCI [Member] | Dec. 31, 2011 JCI [Member] | Dec. 31, 2012 Magna [Member] | Dec. 31, 2011 Magna [Member]
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of cash equivalents | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of accounts receivable balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% | 23.00% | 26.00% | 23.00% | 7.00% | 8.00%
Depreciation Expenses | $ 14,298 | $ 8,954 | $ 1,148 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  | 4 years |  | 17 years |  |  |  |  |  |
Change in operating income | 1,007 | 1,073 | 774 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Change in basic and diluted earnings per share | $ 0.02 | $ 0.03 | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rights and ownership purchase of intellectual property |  | 37 | 17 |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000 |  | 7,000 |  |  |  |  |  |  |  |  |  |  |
Amortization of intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 285 | 2,522 |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived trademark assets | 166 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment terms of contracts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 days |  |  | 120 days |  |  |  |  |  |  |
Reimbursable tooling capitalized within prepaid expenses and other current assets |  |  |  |  |  |  | 1,878 | 1,140 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense | 823 | 1,403 | 1,275 | 823 | 1,403 | 1,275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related deferred tax benefit | 1,316 | 1,021 |  | 301 | 427 | 259 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-controlling interest ownership percentage by non controlling owners |  |  |  |  |  |  |  |  | 24.08% | 24.12% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed compensation, gross |  |  |  |  |  |  |  |  |  |  |  |  | € 3.71 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed compensation, net |  |  |  |  |  |  |  |  |  |  |  |  | € 3.17 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tender offer per share amount for acquisition |  |  |  |  |  |  |  |  |  |  |  |  | € 44.95 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition potential cash payment per share |  |  |  |  |  |  |  |  |  |  |  |  | € 85.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domination and Profit and Loss Transfer termination period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Non-controlling interest ownership in former subsidiary held by related party |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, shares acquired |  |  |  |  |  |  |  |  |  |  | 442,253 | 442,253 |  |  | 300,651 | 300,651 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, percentage of shares acquired |  |  |  |  |  |  |  |  |  |  | 14.00% | 14.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, shares issued for acquisition |  |  |  |  |  |  |  |  |  |  | 3,300,000 | 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, cash paid |  |  |  |  |  |  |  |  |  |  | 7,247 | 5,408 |  |  | 34,245 | 25,556 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, percentage of shares acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00% | 99.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, purchase price per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 85 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition cost of acquisition, financed by borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 43,429 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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