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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 | $ 91,694 us-gaap_PropertyPlantAndEquipmentGross | $ 73,964 us-gaap_PropertyPlantAndEquipmentGross
Less -- accumulated depreciation | 47,383 us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation | 37,916 us-gaap_PropertyPlantAndEquipmentOtherAccumulatedDepreciation
Total | 44,311 us-gaap_PropertyPlantAndEquipmentNet | 36,048 us-gaap_PropertyPlantAndEquipmentNet
Furniture, fixtures and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 10,957 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember | 7,486 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_FurnitureAndFixturesMember
Computer and related equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 21,741 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember | 11,358 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerEquipmentMember
Computer Software, Intangible Asset [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 41,416 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember | 35,943 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ComputerSoftwareIntangibleAssetMember
Leasehold improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | 5,637 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember | 4,711 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LeaseholdImprovementsMember
Work-in-progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property and equipment | $ 11,943 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = asgn_WorkInProgressMember | $ 14,466 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = asgn_WorkInProgressMember

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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