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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 32,081 $ 37,360
Accumulated Amortization 30,617 35,026
Total 1,464 2,334
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 30,998 32,270
Accumulated Amortization 29,534 29,936
Total 1,464 2,334
Research Content [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,083 3,583
Accumulated Amortization $ 1,083 3,583
Technology [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Amount   1,507
Accumulated Amortization   $ 1,507