Property, Equipment and Software - Summary of Property, Equipment and Software (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 44,518	$ 39,390
Less accumulated depreciation and amortization	(19,335)	(18,060)
Property, Plant and Equipment, Gross	25,183	21,330
Land	1,490	1,490
Property, Plant and Equipment, Net	26,673	22,820
Buildings [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	15,250	13,988
Office Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	8,693	7,808
Computer Hardware and Software [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	15,719	12,887
Aircraft and Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 4,856	$ 4,707