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Discontinued Operations (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 02, 2015 | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Proceeds from Divestiture of Businesses | $ 123,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |
Gain (Loss) on Disposition of Business |  | 25,703,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation |  | 14,400,000 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation |  |  |
Receivable in escrow |  | 6,000,000 asgn_Receivableinescrow |  |  |
Net working capital receivable |  | 600,000 asgn_Networkingcapitalreceivable |  |  |
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  |  |  | (2,854,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents |
Cash and cash equivalents |  | 76,363,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 23,394,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 28,860,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  |  | (21,615,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |
Accounts receivable, net |  | 287,759,000 us-gaap_AccountsReceivableNetCurrent |  | 277,146,000 us-gaap_AccountsReceivableNetCurrent |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets |  |  |  | (1,205,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets |
Prepaid expenses and income taxes |  | 4,712,000 us-gaap_PrepaidExpenseCurrent |  | 13,308,000 us-gaap_PrepaidExpenseCurrent |
Disposal Group, Including Discontinued Operation, Deferred Tax Asset, Current |  |  |  | (3,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent |
Deferred income tax assets |  | 15,970,000 us-gaap_DeferredTaxAssetsNetCurrent |  | 15,746,000 us-gaap_DeferredTaxAssetsNetCurrent |
Workers' compensation receivable |  | 13,807,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |  | 13,370,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |
Disposal Group, Including Discontinued Operations, Workers' Compensation and Medical Malpractice Receivable, Current |  |  |  | (5,358,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent |
Other current assets |  | 11,160,000 us-gaap_OtherAssetsCurrent |  | 3,121,000 us-gaap_OtherAssetsCurrent |
Disposal Group, Including Discontinued Operation, Other Assets, Current |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |
Disposal Group, Including Discontinued Operation, Assets, Current |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  | 34,353,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Assets, Current |  | 409,771,000 us-gaap_AssetsCurrent |  | 385,904,000 us-gaap_AssetsCurrent |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  |  | (2,508,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |
Property and equipment, net |  | 44,954,000 us-gaap_PropertyPlantAndEquipmentNet |  | 44,311,000 us-gaap_PropertyPlantAndEquipmentNet |
Goodwill |  | 510,164,000 us-gaap_Goodwill |  | 512,060,000 us-gaap_Goodwill | 514,426,000 us-gaap_Goodwill
Identifiable intangible assets, net |  | 245,410,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 250,609,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Disposal Group, Including Discontinued Operation, Goodwill |  |  |  | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 |
Disposal Group, Including Discontinued Operation, Intangible Assets |  |  |  | (11,960,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |  |  |  | (568,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets |
Other non-current assets |  | 7,339,000 us-gaap_OtherAssetsNoncurrent |  | 7,617,000 us-gaap_OtherAssetsNoncurrent |
Disposal Group, Including Discontinued Operation, Other Assets |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |  | 73,673,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |
Disposal Group, Including Discontinued Operation, Assets |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |
Assets |  | 1,217,638,000 us-gaap_Assets |  | 1,274,174,000 us-gaap_Assets |
Current portion of long-term debt |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent |
Disposal Group, Including Discontinued Operation, Accounts Payable |  |  |  | (951,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |
Accounts payable |  | 6,157,000 us-gaap_AccountsPayableCurrent |  | 7,925,000 us-gaap_AccountsPayableCurrent |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  |  |  | (4,626,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |
Accrued payroll and contract professional pay |  | 84,340,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 82,563,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |
Disposal Group Workers' Compensation and Medical Malpractice Liability, Current |  |  |  | (13,571,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent |
Workers’ compensation loss reserves |  | 15,715,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |  | 15,564,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |
Income taxes payable |  | 12,489,000 us-gaap_AccruedIncomeTaxesCurrent |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent |
Disposal Group, Including Discontinued Operation, Other Liabilities, Current |  |  |  | (1,047,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |
Other current liabilities |  | 17,740,000 us-gaap_OtherLiabilitiesCurrent |  | 20,729,000 us-gaap_OtherLiabilitiesCurrent |
Disposal Group, Including Discontinued Operation, Liabilities, Current |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |  | 20,195,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Liabilities, Current |  | 154,691,000 us-gaap_LiabilitiesCurrent |  | 165,566,000 us-gaap_LiabilitiesCurrent |
Long-term debt |  | 316,313,000 us-gaap_LongTermDebtNoncurrent |  | 396,875,000 us-gaap_LongTermDebtNoncurrent |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent |  |  |  | (4,088,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent |
Deferred income tax liabilities |  | 63,734,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |  | 63,821,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  |  |  | (1,479,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities |
Other long-term liabilities |  | 8,072,000 us-gaap_OtherLiabilitiesNoncurrent |  | 7,937,000 us-gaap_OtherLiabilitiesNoncurrent |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |  | 5,567,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |
Liabilities |  | 542,810,000 us-gaap_Liabilities |  | 639,766,000 us-gaap_Liabilities |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  | (1,778,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | (492,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations |  |
Cash received from sale of discontinued operations, net |  | 114,884,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 0 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |  |
Other Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 14,000 asgn_OtherCashProvidedbyUsedinInvestingActivitiesDiscontinuedOperations | 113,000 asgn_OtherCashProvidedbyUsedinInvestingActivitiesDiscontinuedOperations |  |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  | 114,870,000 us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | (113,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations |  |
Disposal Group, Including Discontinued Operation, Revenue |  | 12,068,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 32,423,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |
Disposal Group Including Discontinued Operations Cost of Services |  | 8,653,000 asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices | 23,079,000 asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices |  |
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) |  | 3,415,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss | 9,344,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense |  | 2,641,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense | 8,145,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense |  |
Disposal Group, Including Discontinued Operation, Depreciation and Amortization |  | 155,000 asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets | 634,000 asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  | 619,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 565,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | 210,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 253,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  | 409,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 312,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  |
Scenario, Previously Reported [Member] |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |
Cash and cash equivalents |  |  |  | 31,714,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accounts receivable, net |  |  |  | 298,761,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Prepaid expenses and income taxes |  |  |  | 14,513,000 us-gaap_PrepaidExpenseCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Deferred income tax assets |  |  |  | 19,067,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Workers' compensation receivable |  |  |  | 18,728,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other current assets |  |  |  | 3,121,000 us-gaap_OtherAssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Disposal Group, Including Discontinued Operation, Assets, Current |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Assets, Current |  |  |  | 385,904,000 us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Property and equipment, net |  |  |  | 46,819,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Goodwill |  |  |  | 570,697,000 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Identifiable intangible assets, net |  |  |  | 262,569,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other non-current assets |  |  |  | 8,185,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Disposal Group, Including Discontinued Operation, Other Assets |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Assets |  |  |  | 1,274,174,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Current portion of long-term debt |  |  |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accounts payable |  |  |  | 8,876,000 us-gaap_AccountsPayableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accrued payroll and contract professional pay |  |  |  | 87,189,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Workers’ compensation loss reserves |  |  |  | 29,135,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Income taxes payable |  |  |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other current liabilities |  |  |  | 21,776,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Disposal Group, Including Discontinued Operation, Liabilities, Current |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Liabilities, Current |  |  |  | 165,566,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Long-term debt |  |  |  | 396,875,000 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Deferred income tax liabilities |  |  |  | 67,909,000 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other long-term liabilities |  |  |  | 9,416,000 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Liabilities |  |  |  | $ 639,766,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |

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