Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Cost	$ 181,862	$ 184,109
Accumulated depreciation	(139,027)	(138,970)
Property, plant and equipment, net	42,835	45,139
Buildings [Member]
Property Plant And Equipment [Line Items]
Cost	3,746	3,725
Plant and equipment [Member]
Property Plant And Equipment [Line Items]
Cost	45,744	47,588
Instrumentation [Member]
Property Plant And Equipment [Line Items]
Cost	75,542	75,818
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Cost	6,599	7,605
Computer software [Member]
Property Plant And Equipment [Line Items]
Cost	47,322	48,604
Construction in progress [Member]
Property Plant And Equipment [Line Items]
Cost	$ 2,909	$ 769

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, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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