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Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Intangible Assets By Major Class [Line Items]    
Gross $ 543,226 $ 265,725
Accumulated Amortization 43,499 41,033
Net Book Value 499,727 224,692
Patents    
Intangible Assets By Major Class [Line Items]    
Gross 31,581 31,581
Accumulated Amortization 31,568 31,543
Net Book Value $ 13 38
Patents | Minimum    
Intangible Assets By Major Class [Line Items]    
Useful Life (years) 2 years  
Patents | Maximum    
Intangible Assets By Major Class [Line Items]    
Useful Life (years) 16 years  
Other Intangible Assets    
Intangible Assets By Major Class [Line Items]    
Gross $ 54,448 15,780
Accumulated Amortization 11,931 9,490
Net Book Value $ 42,517 6,290
Other Intangible Assets | Minimum    
Intangible Assets By Major Class [Line Items]    
Useful Life (years) 1 year  
Other Intangible Assets | Maximum    
Intangible Assets By Major Class [Line Items]    
Useful Life (years) 10 years  
Trade name, trademark and trade dress and other    
Intangible Assets By Major Class [Line Items]    
Gross $ 457,197 218,364
Net Book Value $ 457,197 $ 218,364