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Property, Plant and Equipment - Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Abstract]
Land	$ 4,575	$ 4,575
Building and land improvements	35,154	35,142
Building	68,167	68,169
Furniture and fixtures	19,946	19,965
Computer hardware and software	70,889	70,942
Engineering and other equipment	133,065	132,920
Total property, plant and equipment	331,796	331,713
Less: accumulated depreciation	(271,639)	(269,314)
Total property, plant and equipment, net	$ 60,157	$ 62,399

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

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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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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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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