Financial Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments in marketable securities	$ 6,150	$ 4,785
Contingent consideration liabilities	20,313	51,196
Derivative assets		1,279
Derivative liabilities		598
Quoted Prices In Active Markets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments in marketable securities	6,150	4,785
Contingent consideration liabilities
Derivative assets
Derivative liabilities
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments in marketable securities
Contingent consideration liabilities
Derivative assets		1,279
Derivative liabilities		598
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Investments in marketable securities
Contingent consideration liabilities	20,313	51,196
Derivative assets
Derivative liabilities