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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
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