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v2.4.1.9

Segment Reporting (Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 segment | Mar. 31, 2014
Revenues: |  |
Revenues | $ 430,045 us-gaap_SalesRevenueServicesNet | $ 406,851 us-gaap_SalesRevenueServicesNet
Gross Profit: |  |
Total Gross Profit | 135,875 us-gaap_GrossProfit | 128,155 us-gaap_GrossProfit
Operating Income (Loss): |  |
Total Operating Income | 25,071 us-gaap_OperatingIncomeLoss | 26,508 us-gaap_OperatingIncomeLoss
Amortization of Intangible Assets | 4,869 us-gaap_AmortizationOfIntangibleAssets | 5,538 us-gaap_AmortizationOfIntangibleAssets
Reportable segments (in number of segments) | 3 us-gaap_NumberOfReportableSegments |
Corporate Segment [Member] |  |
Operating Income (Loss): |  |
Total Operating Income | (13,585)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | (11,882)us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Amortization of Intangible Assets | 0 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember | 8 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember
Apex |  |
Revenues: |  |
Revenues | 294,293 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 278,408 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Gross Profit: |  |
Total Gross Profit | 79,643 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 75,506 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Operating Income (Loss): |  |
Total Operating Income | 22,911 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 22,784 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Amortization of Intangible Assets | 3,522 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 4,089 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Oxford |  |
Revenues: |  |
Revenues | 127,471 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 117,500 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Gross Profit: |  |
Total Gross Profit | 53,524 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 49,026 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Operating Income (Loss): |  |
Total Operating Income | 15,353 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 14,284 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Amortization of Intangible Assets | 1,300 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember | 1,370 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_OxfordSegmentMember
Life Sciences Europe |  |
Revenues: |  |
Revenues | 8,281 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 10,943 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Gross Profit: |  |
Total Gross Profit | 2,708 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,623 us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Operating Income (Loss): |  |
Total Operating Income | 392 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 1,322 us-gaap_OperatingIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Amortization of Intangible Assets | 47 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 71 us-gaap_AmortizationOfIntangibleAssets / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember
Physician Segment [Member] |  |
Operating Income (Loss): |  |
Total Operating Income |  | $ 361 us-gaap_OperatingIncomeLoss / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = asgn_PhysicianSegmentMember

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