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Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 28,320 $ 23,213
Less accumulated depreciation 16,627 14,164
Property and equipment, net of accumulated depreciation 11,693 9,049
Land and Building [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 919 919
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 19,925 17,746
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 7,476 $ 4,548