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Other Intangible Assets, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Original amount $ 42,984 $ 42,984
Accumulated amortization 24,589 20,829
Other intangible assets, net $ 18,395 22,155
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 8 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 20 years  
Core Technology    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 8 years  
Original amount $ 17,464 17,464
Accumulated amortization 6,927 4,743
Other intangible assets, net 10,537 12,721
Trademarks and trade names    
Finite-Lived Intangible Assets [Line Items]    
Original amount 25,520 25,520
Accumulated amortization 17,662 16,086
Other intangible assets, net $ 7,858 $ 9,434
Trademarks and trade names | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 15 years  
Trademarks and trade names | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful lives of intangible assets 20 years