Property, Plant, and Equipment - 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	$ 123,495	$ 114,082
Less: accumulated depreciation	(69,503)	(60,797)
Property, Plant and Equipment, Net, Total	53,992	53,285
Land [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	3,951	3,951
Building [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	23,280	23,439
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	28,049	25,741
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	5,237	4,999
Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	39,409	35,350
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	18,726	16,201
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and equipment, gross	$ 4,843	$ 4,401