Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 37,360	$ 39,274
Accumulated Amortization	35,026	35,892
Total	2,334	3,382
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	32,270	32,995
Accumulated Amortization	29,936	29,613
Total	2,334	3,382
Research Content [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,583	4,699
Accumulated Amortization	3,583	4,699
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,507	1,507
Accumulated Amortization	$ 1,507	1,507
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount		73
Accumulated Amortization		$ 73