Property, Equipment and Software - Summary of Property, Equipment and Software (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 54,800	$ 44,972
Less accumulated depreciation and amortization	(24,566)	(21,650)
Property, Plant and Equipment, Gross	30,234	23,322
Land	1,490	1,490
Property, Plant and Equipment, Net	31,724	24,812
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	16,551	16,501
Office Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	12,805	11,809
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	25,041	16,484
Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 403	$ 178