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Property and Equipment (Narratives) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property, Plant and Equipment [Line Items] |  |  |
Net book value | $ 44,311,000 us-gaap_PropertyPlantAndEquipmentNet | $ 36,048,000 us-gaap_PropertyPlantAndEquipmentNet |
Depreciation | 12,300,000 us-gaap_Depreciation | 7,200,000 us-gaap_Depreciation | 5,700,000 us-gaap_Depreciation
Document Fiscal Year Focus | 2014 |  |
Software Development |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net book value | 14,000,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember | 13,400,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_SoftwareDevelopmentMember |
Software Development Work-in-Progress |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net book value | $ 9,000,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = asgn_SoftwareDevelopmentWorkInProgressMember | $ 10,000,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = asgn_SoftwareDevelopmentWorkInProgressMember |

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