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Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in marketable securities | $ 5,376 | $ 4,785
Derivative assets | 466 | 1,279
Derivative liabilities | 1,212 | 598
Contingent consideration liabilities | 32,473 | 51,196
Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in marketable securities | 5,376 | 4,785
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative assets | 466 | 1,279
Derivative liabilities | 1,212 | 598
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Contingent consideration liabilities | $ 32,473 | $ 51,196

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