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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 | $ 0 us-gaap_GoodwillPurchaseAccountingAdjustments | $ 0 us-gaap_GoodwillPurchaseAccountingAdjustments | $ 1,805 us-gaap_GoodwillPurchaseAccountingAdjustments
Goodwill [Roll Forward] |  |  |
Gross goodwill | 514,426 us-gaap_GoodwillGross | 444,084 us-gaap_GoodwillGross |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Goodwill | 514,426 us-gaap_Goodwill | 444,084 us-gaap_Goodwill |
Translation adjustment | (2,366)us-gaap_GoodwillTranslationAdjustments | 811 us-gaap_GoodwillTranslationAdjustments |
Gross goodwill | 512,060 us-gaap_GoodwillGross | 514,426 us-gaap_GoodwillGross | 444,084 us-gaap_GoodwillGross
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill | 512,060 us-gaap_Goodwill | 514,426 us-gaap_Goodwill | 444,084 us-gaap_Goodwill
Goodwill | 512,060 us-gaap_Goodwill | 514,426 us-gaap_Goodwill | 444,084 us-gaap_Goodwill
CyberCoders [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 69,018 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |
Apex |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 289,712 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 289,712 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Translation adjustment | (1,761)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Gross goodwill | 287,951 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 287,951 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Goodwill | 287,951 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Oxford |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 220,150 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 150,619 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,150 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 150,619 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill, Other Changes |  | 513 us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Translation adjustment | (120)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Gross goodwill | 220,030 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,030 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Goodwill | 220,030 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Oxford | CyberCoders [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Goodwill, Acquired During Period |  | 69,018 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Life Sciences Europe [Member] |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 4,564 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,753 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | 4,564 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,753 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Translation adjustment | (485)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 811 us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Gross goodwill | 4,079 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Accumulated impairment loss |  | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | 4,079 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
Goodwill | $ 4,079 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | $ 4,564 us-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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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount before 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 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of other (increase) decrease of an asset representing the 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the 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 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e961-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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