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Financial Liabilities Measured At Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Jun. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Dec. 31, 2010
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion | $ 9,850 | $ 8,237 | $ 14,990 | $ 24,731 | $ 23,882 | $ 19,864
Fair Value, Inputs, Level 3 |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Acquisition-related contingent consideration, including current portion | $ 9,850 |  | $ 14,990 |  |  |

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- Definition Fair value, as of the period end date, of potential payments under the contingent consideration arrangement including cash and shares. + References No definition available. + Details
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- Details
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