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Fair value measurement - financial assets and liabilities carried at fair value measured on recurring basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investments in marketable securities $ 6,922 $ 6,863
Derivative assets 329  
Derivative liabilities 1,298  
Contingent consideration liabilities 20,829 33,433
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investments in marketable securities 6,922 6,863
Derivative assets 0  
Derivative liabilities 0  
Contingent consideration liabilities 0 0
Significant Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investments in marketable securities 0 0
Derivative assets 329  
Derivative liabilities 1,298  
Contingent consideration liabilities 0 0
Significant Unobservable Inputs (Level 3)    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Investments in marketable securities 0 0
Derivative assets 0  
Derivative liabilities 0  
Contingent consideration liabilities $ 20,829 $ 33,433