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Schedule of Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Marketable securities $ 743,624 $ 1,004,576
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 264,705 294,256
Marketable securities 743,624 1,004,576
Derivative assets 109 220
Contingent consideration 37,436 3,350
Derivative liabilities 146 369
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash and cash equivalents 264,705 294,256
Marketable securities 743,624 1,004,576
Derivative assets 109 220
Contingent consideration 37,436 3,350
Derivative liabilities $ 146 $ 369