Annual report pursuant to Section 13 and 15(d)

Annual report pursuant to Section 13 and 15(d)

Acquisitions - Summary of Final Amounts for the Fair Values of Assets Acquired and Liabilities Assumed (Detail)

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Acquisitions - Summary of Final Amounts for the Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 10, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill $ 197,892   $ 147,019 $ 147,019
Genoptix        
Business Acquisition [Line Items]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets   $ 22,172    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment   21,029    
Identifiable intangible assets   71,792    
Goodwill $ 50,900 50,873    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Assets   170    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total   166,036    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities   (10,769)    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities   (15,265)    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net, Total   140,002    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent   $ (14,700)