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Property and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]    
Document Fiscal Year Focus 2014  
Property and equipment $ 91,694us-gaap_PropertyPlantAndEquipmentGross $ 73,964us-gaap_PropertyPlantAndEquipmentGross
Less -- accumulated depreciation 47,383us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation 37,916us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation
Total 44,311us-gaap_PropertyPlantAndEquipmentNet 36,048us-gaap_PropertyPlantAndEquipmentNet
Furniture, fixtures and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 10,957us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
7,486us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Computer and related equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 21,741us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
11,358us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
Computer Software, Intangible Asset [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 41,416us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
35,943us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment 5,637us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
4,711us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Work-in-progress [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment $ 11,943us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= asgn_WorkInProgressMember
$ 14,466us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= asgn_WorkInProgressMember