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Property, Plant and Equipment - Property, Plant and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Abstract]
Land	$ 4,575	$ 4,575
Building and land improvements	35,578	35,142
Building	68,157	68,169
Furniture and fixtures	19,917	19,965
Computer hardware and software	72,274	70,942
Engineering and other equipment	134,771	132,920
Total Property, Plant and Equipment	335,272	331,713
Less: accumulated depreciation	(279,506)	(269,314)
Total Property, Plant and Equipment, net	$ 55,766	$ 62,399

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Amount before accumulated depreciation of building structures held for productive use.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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