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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 29,142 $ 28,320
Less accumulated depreciation 16,848 16,627
Property and equipment, net of accumulated depreciation 12,294 11,693
Land and Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross   919
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 20,471 19,925
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 8,671 $ 7,476