Company Operations and Summary of Significant Accounting Policies - Property, Plant and equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 121,309	$ 112,144
Less: accumulated depreciation and amortization	(70,451)	(59,597)
Total property, plant and equipment, net	50,858	52,547
Equipment, furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	61,972	59,736
Building and building improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,243	33,048
Instruments available for lease [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,014	18,280
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,080	$ 1,080