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Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Intangible Assets By Major Class [Line Items]      
Gross $ 265,725   $ 265,725
Accumulated Amortization 40,234   39,967
Net Book Value 225,491   225,758
Aggregate amortization expense on intangible assets 267 $ 58  
Patents      
Intangible Assets By Major Class [Line Items]      
Gross 31,581   31,581
Accumulated Amortization 31,505   31,491
Net Book Value $ 76   90
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    
Developed technology and other      
Intangible Assets By Major Class [Line Items]      
Gross $ 15,780   15,780
Accumulated Amortization 8,729   8,476
Net Book Value $ 7,051   7,304
Developed technology and other | Minimum      
Intangible Assets By Major Class [Line Items]      
Useful Life (years) 1 year    
Developed technology and other | 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 $ 218,364   218,364
Net Book Value $ 218,364   $ 218,364