Property and Equipment - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 21,541	$ 21,361
Accumulated depreciation and amortization	(15,210)	(15,103)
Property and equipment, net	6,331	6,258
Land and Office Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	7,819	7,798
Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	6,097	6,150
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	7,366	7,339
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	74	$ 74
Finance Lease Right-of-use Assets [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 185