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W.E.T. Acquisition - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 12 Months Ended |  | 1 Months Ended |
--- | --- | --- | --- | --- | ---
May 16, 2012 USD ($) | May 16, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 | May 16, 2012 W.E.T. [Member] EUR (€) | Aug. 31, 2011 W.E.T. [Member] USD ($) | Aug. 31, 2011 W.E.T. [Member] EUR (€) | May 26, 2011 W.E.T. [Member] USD ($) | May 26, 2011 W.E.T. [Member] EUR (€) | May 16, 2011 W.E.T. [Member] USD ($) | May 16, 2011 W.E.T. [Member] EUR (€)
Acquisitions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition shares of voting interests acquired | 110,325 |  |  | 2,660 |  |  |  | 2,903 | 2,903 | 2,316,175 | 2,316,175
Business acquisition percentage of voting interests acquired |  |  |  | 76.00% |  |  |  | 76.28% | 76.28% | 76.19% | 76.19%
Tender offer price per share |  |  |  |  |  |  |  |  |  |  | € 40
Total business acquisition consideration |  |  |  |  |  |  |  | $ 130,889 | € 92,763 |  |
Business acquisition debt assumed |  |  |  |  |  |  |  | 51,570 | 36,322 |  |
Business acquisition cash acquired |  | 17,457 |  |  |  |  |  | 17,457 | 12,372 |  |
Business acquisition treasury shares issued |  |  |  |  | 143,683 | 16,305 | 16,305 |  |  |  |
Treasury stock price per share |  |  |  |  | € 44.95 | $ 67.97 | € 50.00 |  |  |  |
Treasury shares acquired value | 6,400 |  | 3,380 |  |  |  |  |  |  |  |
Account Receivable, Gross |  |  |  |  |  |  |  |  |  | 59,438 |
Account Receivable, expected uncollectible |  |  |  |  |  |  |  |  |  | $ 1,968 |

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