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Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Intangible Assets By Major Class [Line Items]    
Gross $ 539,444 $ 265,725
Accumulated Amortization 42,253 41,033
Net Book Value 497,191 224,692
Patents    
Intangible Assets By Major Class [Line Items]    
Gross 31,581 31,581
Accumulated Amortization 31,556 31,543
Net Book Value $ 25 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 $ 53,921 15,780
Accumulated Amortization 10,697 9,490
Net Book Value $ 43,224 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 $ 453,942 218,364
Net Book Value $ 453,942 $ 218,364