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Schedule of Reported Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Apr. 02, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets $ 1,482,530 $ 1,612,752
Liabilities 38,023 38,463
Other Current Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 107  
Other Accrued Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities   131
Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 324,746 307,884
Marketable securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 895,578 871,024
Long-term marketable securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 262,061 433,843
Prepayments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 145 1
Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 21,711 1,050
Long Term Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 16,205 37,282
Quoted Prices in Active Markets for Identical Instruments (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 338,489 270,351
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 318,503 252,180
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Long-term marketable securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 19,986 18,171
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 1,144,041 1,342,401
Liabilities 107 131
Significant Other Observable Inputs (Level 2) | Other Current Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 107  
Significant Other Observable Inputs (Level 2) | Other Accrued Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities   131
Significant Other Observable Inputs (Level 2) | Cash and Cash Equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 6,243 55,704
Significant Other Observable Inputs (Level 2) | Marketable securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 895,578 871,024
Significant Other Observable Inputs (Level 2) | Long-term marketable securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 242,075 415,672
Significant Other Observable Inputs (Level 2) | Prepayments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Assets 145 1
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 37,916 38,332
Significant Unobservable Inputs (Level 3) | Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities 21,711 1,050
Significant Unobservable Inputs (Level 3) | Long Term Contingent Consideration    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis    
Liabilities $ 16,205 $ 37,282