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Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets by Major Class [Line Items]    
Gross $ 265,725 $ 128,152
Accumulated amortization 39,967 39,421
Net book value 225,758 88,731
Trade name, trademark and trade dress and other    
Intangible Assets by Major Class [Line Items]    
Gross 218,364 88,590
Net book value 218,364 88,590
Patents    
Intangible Assets by Major Class [Line Items]    
Gross 31,581 31,581
Accumulated amortization 31,491 31,440
Net book value $ 90 141
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 7,981
Accumulated amortization 8,476 7,981
Net book value $ 7,304 $ 0
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) 9 years