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Property, Equipment and Software - Summary of Property, Equipment and Software (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment $ 37,327us-gaap_PropertyPlantAndEquipmentGross $ 32,719us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (16,142)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (13,660)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property, Plant and Equipment, Gross 21,185bbsi_PropertyPlantAndEquipmentNetExcludingLand 19,059bbsi_PropertyPlantAndEquipmentNetExcludingLand
Land 1,490us-gaap_Land 1,490us-gaap_Land
Property, Plant and Equipment, Net 22,675us-gaap_PropertyPlantAndEquipmentNet 20,549us-gaap_PropertyPlantAndEquipmentNet
Buildings [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment 13,004us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
11,158us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingMember
Office Furniture and Fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment 6,706us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
5,548us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_OfficeEquipmentMember
Computer Hardware and Software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment 12,949us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
11,396us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Aircraft [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment $ 4,668us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember
$ 4,617us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AirTransportationEquipmentMember