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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 36,876 $ 32,818
Accumulated Amortization 31,925 32,086
Total 4,951 732
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 32,823 31,735
Accumulated Amortization 31,604 31,003
Total 1,219 732
Research Content [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount   1,083
Accumulated Amortization   $ 1,083
Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,610  
Accumulated Amortization 295  
Total 3,315  
Trade Names [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 443  
Accumulated Amortization 26  
Total $ 417