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Goodwill and Identifiable Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Roll Forward] |  |  |
Gross goodwill | $ 510,164 us-gaap_GoodwillGross | $ 512,060 us-gaap_GoodwillGross | $ 514,426 us-gaap_GoodwillGross
Accumulated impairment loss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Goodwill | 510,164 us-gaap_Goodwill | 512,060 us-gaap_Goodwill | 514,426 us-gaap_Goodwill
Translation adjustment | (1,896)us-gaap_GoodwillTranslationAdjustments | (2,366)us-gaap_GoodwillTranslationAdjustments |
Apex |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 286,539 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 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 | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Goodwill | 286,539 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 287,951 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 289,712 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Translation adjustment | (1,412)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | (1,761)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember |
Oxford |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 219,934 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 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 | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Goodwill | 219,934 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,030 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 220,150 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Translation adjustment | (96)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | (120)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember |
Life Sciences Europe |  |  |
Goodwill [Roll Forward] |  |  |
Gross goodwill | 3,691 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 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 | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Goodwill | 3,691 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,079 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Translation adjustment | $ (388)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | $ (485)us-gaap_GoodwillTranslationAdjustments / 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 (decrease) from foreign currency translation adjustments 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 (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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