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Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Goodwill, Purchase Accounting Adjustments | $ 0us-gaap_GoodwillPurchaseAccountingAdjustments | $ 0us-gaap_GoodwillPurchaseAccountingAdjustments | $ 1,805us-gaap_GoodwillPurchaseAccountingAdjustments
Goodwill [Roll Forward] |  |  |
Gross goodwill | 573,063us-gaap_GoodwillGross | 617,875us-gaap_GoodwillGross |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (121,717)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Goodwill | 573,063us-gaap_Goodwill | 496,158us-gaap_Goodwill |
Goodwill, Written off Related to Sale of Business Unit |  | 121,717us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit |
Write-off of accum impairment loss related to sale of business unit |  | 121,717asgn_WriteOffOfAccumImpairmentLossRelatedToSaleOfBusinessUnit |
Translation adjustment | (2,366)us-gaap_GoodwillTranslationAdjustments | 811us-gaap_GoodwillTranslationAdjustments |
Gross goodwill | 570,697us-gaap_GoodwillGross | 573,063us-gaap_GoodwillGross | 617,875us-gaap_GoodwillGross
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | (121,717)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill | 570,697us-gaap_Goodwill | 573,063us-gaap_Goodwill | 496,158us-gaap_Goodwill
Goodwill | 570,697us-gaap_Goodwill | 573,063us-gaap_Goodwill | 496,158us-gaap_Goodwill
Whitaker [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 7,076us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_WhitakerMember |
CyberCoders [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 69,018us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |
Apex |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 289,712us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 289,712us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Translation adjustment | (1,761)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Gross goodwill | 287,951us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 287,951us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 287,951us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Oxford |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 220,150us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 150,619us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,150us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 150,619us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill, Other Changes |  | 513us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Translation adjustment | (120)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Gross goodwill | 220,030us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,030us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,030us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Oxford | CyberCoders [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 69,018us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Healthcare |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill |  | 122,230us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Accumulated impairment loss |  | (121,717)us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Goodwill |  | 513us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Goodwill, Written off Related to Sale of Business Unit |  | 121,717us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Write-off of accum impairment loss related to sale of business unit |  | 121,717asgn_WriteOffOfAccumImpairmentLossRelatedToSaleOfBusinessUnit / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Goodwill, Other Changes |  | (513)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Translation adjustment |  | 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Gross goodwill | 0us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember | 0us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Accumulated impairment loss |  | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Goodwill | 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember | 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Goodwill | 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember | 0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_HealthcareSegmentMember |
Physician |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 58,637us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 51,561us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Goodwill | 58,637us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 51,561us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Translation adjustment | 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Gross goodwill | 58,637us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 58,637us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Goodwill | 58,637us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 58,637us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Goodwill | 58,637us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember | 58,637us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Physician | Whitaker [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 7,076us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_WhitakerMember / us-gaap_StatementBusinessSegmentsAxis = asgn_PhysicianSegmentMember |
Life Sciences Europe [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 4,564us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,753us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Accumulated impairment loss | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | 4,564us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,753us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Translation adjustment | (485)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 811us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Gross goodwill | 4,079us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Accumulated impairment loss |  | 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | 4,079us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | $ 4,079us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | $ 4,564us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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