XML 99 R49.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Discontinued Operations Discontinued Operations (Details) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 01, 2015 | Dec. 02, 2013 | Feb. 12, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Provided by (Used in) Operating Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  | $ 836,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | $ (108,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations | $ 123,000 us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations |  |
Cash and cash equivalents |  |  |  | 31,714,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  | 31,714,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 27,479,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 17,739,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents |  |  |  | (2,854,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents |  |  |  | (2,326,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents |  |  |  | (2,854,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents | (2,326,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents |  | (2,326,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationCashAndCashEquivalents |
Cash |  |  |  | 28,860,000 us-gaap_Cash |  |  |  | 35,024,000 us-gaap_Cash |  |  |  | 28,860,000 us-gaap_Cash | 35,024,000 us-gaap_Cash |  | 35,024,000 us-gaap_Cash |
Proceeds from Divestiture of Businesses | 123,000,000 us-gaap_ProceedsFromDivestitureOfBusinesses | 28,700,000 us-gaap_ProceedsFromDivestitureOfBusinesses | 33,700,000 us-gaap_ProceedsFromDivestitureOfBusinesses |  |  |  |  |  |  |  |  |  |  |  |  |
Receivable in escrow | 6,000,000 asgn_Receivableinescrow |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sale of discontinued operations, net of income taxes | 25,703,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 16,400,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 14,400,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 30,840,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |
Disposal Group, Including Discontinued Operation, Revenue |  |  |  |  |  |  |  |  |  |  |  | 137,166,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 153,465,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | 207,770,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue |  |
Disposal Group Including Discontinued Operations Cost of Services |  |  |  |  |  |  |  |  |  |  |  | 94,848,000 asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices | 106,728,000 asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices | 144,701,000 asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices |  |
Disposal Group, Including Discontinued Operation, Gross Profit (Loss) |  |  |  |  |  |  |  |  |  |  |  | 42,318,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss | 46,737,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss | 63,069,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss |  |
Disposal Group, Including Discontinued Operation, Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  | 6,519,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 6,938,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss | 19,766,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss |  |
Disposal Group, Including Discontinued Operation, Interest Expense |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (2,456,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense | (4,415,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense |  |
Discontinued Operation, Tax Effect of Discontinued Operation |  | 10,400,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 9,100,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  |  |  |  |  |  |  |  | 2,830,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 1,950,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation | 6,161,000 us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation |  |
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent |  |  |  | 947,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,282,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,148,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 312,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 16,089,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 1,494,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 690,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 15,099,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 3,689,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 2,532,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 9,190,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity |  |
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation | 14,400,000 us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net of allowance of $4,404 and $2,465, respectively |  |  |  | 277,146,000 us-gaap_AccountsReceivableNetCurrent |  |  |  | 241,905,000 us-gaap_AccountsReceivableNetCurrent |  |  |  | 277,146,000 us-gaap_AccountsReceivableNetCurrent | 241,905,000 us-gaap_AccountsReceivableNetCurrent |  | 241,905,000 us-gaap_AccountsReceivableNetCurrent |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net |  |  |  | (21,615,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |  |  |  | (20,295,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |  |  |  | (21,615,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet | (20,295,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |  | (20,295,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet |
Prepaid expenses and income taxes |  |  |  | 13,308,000 us-gaap_PrepaidExpenseCurrent |  |  |  | 7,482,000 us-gaap_PrepaidExpenseCurrent |  |  |  | 13,308,000 us-gaap_PrepaidExpenseCurrent | 7,482,000 us-gaap_PrepaidExpenseCurrent |  | 7,482,000 us-gaap_PrepaidExpenseCurrent |
Disposal Group, Including Discontinued Operation, Prepaid and Other Assets |  |  |  | (1,205,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets |  |  |  | (1,204,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets |  |  |  | (1,205,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets | (1,204,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets |  | (1,204,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPrepaidAndOtherAssets |
Deferred income tax assets |  |  |  | 15,746,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |  | 14,374,000 us-gaap_DeferredTaxAssetsNetCurrent |  |  |  | 15,746,000 us-gaap_DeferredTaxAssetsNetCurrent | 14,374,000 us-gaap_DeferredTaxAssetsNetCurrent |  | 14,374,000 us-gaap_DeferredTaxAssetsNetCurrent |
Disposal Group, Including Discontinued Operation, Deferred Tax Asset, Current |  |  |  | (3,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent |  |  |  | (3,156,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent |  |  |  | (3,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent | (3,156,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent |  | (3,156,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxAssetCurrent |
Workers' Compensation and Medical Malpractice Receivable, Current |  |  |  | 13,370,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |  |  |  | 14,390,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |  |  |  | 13,370,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent | 14,390,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |  | 14,390,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent |
Disposal Group, Including Discontinued Operations, Workers' Compensation and Medical Malpractice Receivable, Current |  |  |  | (5,358,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent |  |  |  | (6,810,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent |  |  |  | (5,358,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent | (6,810,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent |  | (6,810,000)asgn_DisposalGroupIncludingDiscontinuedOperationsWorkersCompensationandMedicalMalpracticeReceivableCurrent |
Other current assets |  |  |  | 3,121,000 us-gaap_OtherAssetsCurrent |  |  |  | 3,071,000 us-gaap_OtherAssetsCurrent |  |  |  | 3,121,000 us-gaap_OtherAssetsCurrent | 3,071,000 us-gaap_OtherAssetsCurrent |  | 3,071,000 us-gaap_OtherAssetsCurrent |
Disposal Group, Including Discontinued Operation, Other Assets, Current |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  |  |  | (400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets | (400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |  | (400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets |
Disposal Group, Including Discontinued Operation, Assets, Current |  |  |  | 34,353,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 34,191,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 34,353,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | 34,191,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |  | 34,191,000 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Assets, Current |  |  |  | 385,904,000 us-gaap_AssetsCurrent |  |  |  | 350,437,000 us-gaap_AssetsCurrent |  |  |  | 385,904,000 us-gaap_AssetsCurrent | 350,437,000 us-gaap_AssetsCurrent |  | 350,437,000 us-gaap_AssetsCurrent |
Property and equipment, net |  |  |  | 44,311,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 36,048,000 us-gaap_PropertyPlantAndEquipmentNet |  |  |  | 44,311,000 us-gaap_PropertyPlantAndEquipmentNet | 36,048,000 us-gaap_PropertyPlantAndEquipmentNet |  | 36,048,000 us-gaap_PropertyPlantAndEquipmentNet |
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment |  |  |  | (2,508,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |  |  |  | (2,080,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |  |  |  | (2,508,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment | (2,080,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |  | (2,080,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipment |
Goodwill |  |  |  | 512,060,000 us-gaap_Goodwill |  |  |  | 514,426,000 us-gaap_Goodwill |  |  |  | 512,060,000 us-gaap_Goodwill | 514,426,000 us-gaap_Goodwill | 444,084,000 us-gaap_Goodwill | 514,426,000 us-gaap_Goodwill |
Disposal Group, Including Discontinued Operation, Goodwill |  |  |  | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 |  |  |  | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 |  |  |  | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 |  | (58,637,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationGoodwill1 |
Identifiable intangible assets, net |  |  |  | 250,609,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 273,623,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  |  | 250,609,000 us-gaap_IntangibleAssetsNetExcludingGoodwill | 273,623,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 273,623,000 us-gaap_IntangibleAssetsNetExcludingGoodwill |
Disposal Group, Including Discontinued Operation, Intangible Assets |  |  |  | (11,960,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets |  |  |  | (14,232,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets |  |  |  | (11,960,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets | (14,232,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets |  | (14,232,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationIntangibleAssets |
Other non-current assets |  |  |  | 7,617,000 us-gaap_OtherAssetsNoncurrent |  |  |  | 8,687,000 us-gaap_OtherAssetsNoncurrent |  |  |  | 7,617,000 us-gaap_OtherAssetsNoncurrent | 8,687,000 us-gaap_OtherAssetsNoncurrent |  | 8,687,000 us-gaap_OtherAssetsNoncurrent |
Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent |  |  |  | (568,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets |  |  |  | (639,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets |  |  |  | (568,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets | (639,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets |  | (639,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  |  |  | 73,673,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |  |  |  | 75,588,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |  |  |  | 73,673,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent | 75,588,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |  | 75,588,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent |
Assets |  |  |  | 1,274,174,000 us-gaap_Assets |  |  |  | 1,258,809,000 us-gaap_Assets |  |  |  | 1,274,174,000 us-gaap_Assets | 1,258,809,000 us-gaap_Assets |  | 1,258,809,000 us-gaap_Assets |
Disposal Group, Including Discontinued Operation, Assets |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation |
Other Long-term Debt, Current |  |  |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent |  |  |  | 10,000,000 us-gaap_OtherLongTermDebtCurrent |  |  |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent | 10,000,000 us-gaap_OtherLongTermDebtCurrent |  | 10,000,000 us-gaap_OtherLongTermDebtCurrent |
Accounts payable |  |  |  | 7,925,000 us-gaap_AccountsPayableCurrent |  |  |  | 7,360,000 us-gaap_AccountsPayableCurrent |  |  |  | 7,925,000 us-gaap_AccountsPayableCurrent | 7,360,000 us-gaap_AccountsPayableCurrent |  | 7,360,000 us-gaap_AccountsPayableCurrent |
Disposal Group, Including Discontinued Operation, Accounts Payable |  |  |  | (951,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |  |  |  | (1,010,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |  |  |  | (951,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable | (1,010,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |  | (1,010,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsPayable |
Accrued payroll and contract professional pay |  |  |  | 82,563,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  |  | 72,246,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  |  | 82,563,000 us-gaap_EmployeeRelatedLiabilitiesCurrent | 72,246,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 72,246,000 us-gaap_EmployeeRelatedLiabilitiesCurrent |
Disposal Group, Including Discontinued Operation, Accrued Liabilities |  |  |  | (4,626,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |  |  |  | (4,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |  |  |  | (4,626,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities | (4,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |  | (4,321,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationAccruedLiabilities |
Workers’ compensation loss reserves |  |  |  | 15,564,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |  |  |  | 17,123,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |  |  |  | 15,564,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent | 17,123,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |  | 17,123,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent |
Disposal Group Workers' Compensation and Medical Malpractice Liability, Current |  |  |  | (13,571,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent |  |  |  | (15,628,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent |  |  |  | (13,571,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent | (15,628,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent |  | (15,628,000)asgn_DisposalGroupWorkersCompensationandMedicalMalpracticeLiabilityCurrent |
Accrued Income Taxes, Current |  |  |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent |  |  |  | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent |  |  |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent |  | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent |
Other current liabilities |  |  |  | 20,729,000 us-gaap_OtherLiabilitiesCurrent |  |  |  | 26,460,000 us-gaap_OtherLiabilitiesCurrent |  |  |  | 20,729,000 us-gaap_OtherLiabilitiesCurrent | 26,460,000 us-gaap_OtherLiabilitiesCurrent |  | 26,460,000 us-gaap_OtherLiabilitiesCurrent |
Disposal Group, Including Discontinued Operation, Other Liabilities, Current |  |  |  | (1,047,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |  |  |  | (1,027,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |  |  |  | (1,047,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities | (1,027,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |  | (1,027,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentLiabilities |
Disposal Group, Including Discontinued Operation, Liabilities, Current |  |  |  | 20,195,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 21,986,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |  |  |  | 20,195,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent | 21,986,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |  | 21,986,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent |
Liabilities, Current |  |  |  | 165,566,000 us-gaap_LiabilitiesCurrent |  |  |  | 168,295,000 us-gaap_LiabilitiesCurrent |  |  |  | 165,566,000 us-gaap_LiabilitiesCurrent | 168,295,000 us-gaap_LiabilitiesCurrent |  | 168,295,000 us-gaap_LiabilitiesCurrent |
Long-term Debt, Excluding Current Maturities |  |  |  | 396,875,000 us-gaap_LongTermDebtNoncurrent |  |  |  | 389,813,000 us-gaap_LongTermDebtNoncurrent |  |  |  | 396,875,000 us-gaap_LongTermDebtNoncurrent | 389,813,000 us-gaap_LongTermDebtNoncurrent |  | 389,813,000 us-gaap_LongTermDebtNoncurrent |
Deferred income tax liabilities |  |  |  | 63,821,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |  | 46,789,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |  |  | 63,821,000 us-gaap_DeferredTaxLiabilitiesNoncurrent | 46,789,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |  | 46,789,000 us-gaap_DeferredTaxLiabilitiesNoncurrent |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities, Noncurrent |  |  |  | (4,088,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent |  |  |  | (3,817,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent |  |  |  | (4,088,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent | (3,817,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent |  | (3,817,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationDeferredTaxLiabilitiesNoncurrent |
Other long-term liabilities |  |  |  | 7,937,000 us-gaap_OtherLiabilitiesNoncurrent |  |  |  | 8,597,000 us-gaap_OtherLiabilitiesNoncurrent |  |  |  | 7,937,000 us-gaap_OtherLiabilitiesNoncurrent | 8,597,000 us-gaap_OtherLiabilitiesNoncurrent |  | 8,597,000 us-gaap_OtherLiabilitiesNoncurrent |
Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent |  |  |  | (1,479,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities |  |  |  | (1,365,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities |  |  |  | (1,479,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities | (1,365,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities |  | (1,365,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentLiabilities |
Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent |  |  |  | 5,567,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |  |  |  | 5,182,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |  |  |  | 5,567,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent | 5,182,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |  | 5,182,000 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent |
Liabilities |  |  |  | 639,766,000 us-gaap_Liabilities |  |  |  | 618,676,000 us-gaap_Liabilities |  |  |  | 639,766,000 us-gaap_Liabilities | 618,676,000 us-gaap_Liabilities |  | 618,676,000 us-gaap_Liabilities |
Disposal Group, Including Discontinued Operation, Liabilities |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation |
Cash Provided by (Used in) Investing Activities, Discontinued Operations |  |  |  |  |  |  |  |  |  |  |  | (308,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | (183,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations | (574,000)us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations |  |
Disposal Group, Including Discontinued Operation, General and Administrative Expense |  |  |  |  |  |  |  |  |  |  |  | 33,078,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense | 38,991,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense | 42,334,000 us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense |  |
Disposal Group Including Discontinued Operations Amortization of Intangible Assets |  |  |  |  |  |  |  |  |  |  |  | 2,721,000 asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets | 808,000 asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets | 969,000 asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets |  |
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax |  |  |  |  |  |  |  |  |  |  |  | 6,519,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 4,482,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax | 15,351,000 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax |  |
Life Sciences Europe [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 4,079,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |  |  |  | 4,564,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |  |  |  | 4,079,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 3,753,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember | 4,564,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember |
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 |  |  |  | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 31,714,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 37,350,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accounts receivable, net of allowance of $4,404 and $2,465, respectively |  |  |  | 298,761,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 262,200,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 298,761,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 262,200,000 us-gaap_AccountsReceivableNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 262,200,000 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 |  |  |  | 8,686,000 us-gaap_PrepaidExpenseCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 14,513,000 us-gaap_PrepaidExpenseCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 8,686,000 us-gaap_PrepaidExpenseCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 8,686,000 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 |  |  |  | 17,530,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 19,067,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 17,530,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 17,530,000 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Workers' Compensation and Medical Malpractice Receivable, Current |  |  |  | 18,728,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 21,200,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 18,728,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 21,200,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 21,200,000 asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other current assets |  |  |  | 3,121,000 us-gaap_OtherAssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 3,471,000 us-gaap_OtherAssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 3,121,000 us-gaap_OtherAssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 3,471,000 us-gaap_OtherAssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 3,471,000 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 |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Assets, Current |  |  |  | 385,904,000 us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 350,437,000 us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 385,904,000 us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 350,437,000 us-gaap_AssetsCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 350,437,000 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 |  |  |  | 38,128,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 46,819,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 38,128,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 38,128,000 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Goodwill |  |  |  | 570,697,000 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 573,063,000 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 570,697,000 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 573,063,000 us-gaap_Goodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 573,063,000 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 |  |  |  | 287,855,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 262,569,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 287,855,000 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 287,855,000 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 |  |  |  | 9,326,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 8,185,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 9,326,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 9,326,000 us-gaap_OtherAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Disposal Group, Including Discontinued Operation, Assets, Noncurrent |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Assets |  |  |  | 1,274,174,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 1,258,809,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 1,274,174,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 1,258,809,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 1,258,809,000 us-gaap_Assets / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other Long-term Debt, Current |  |  |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 10,000,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 18,250,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 10,000,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 10,000,000 us-gaap_OtherLongTermDebtCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accounts payable |  |  |  | 8,876,000 us-gaap_AccountsPayableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 8,370,000 us-gaap_AccountsPayableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 8,876,000 us-gaap_AccountsPayableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 8,370,000 us-gaap_AccountsPayableCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 8,370,000 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 |  |  |  | 76,567,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 87,189,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 76,567,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 76,567,000 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Workers’ compensation loss reserves |  |  |  | 29,135,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 32,751,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 29,135,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 32,751,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 32,751,000 asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Accrued Income Taxes, Current |  |  |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 340,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 13,120,000 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Other current liabilities |  |  |  | 21,776,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 27,487,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 21,776,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 27,487,000 us-gaap_OtherLiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 27,487,000 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 |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Liabilities, Current |  |  |  | 165,566,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 168,295,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 165,566,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 168,295,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 168,295,000 us-gaap_LiabilitiesCurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Long-term Debt, Excluding Current Maturities |  |  |  | 396,875,000 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 389,813,000 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 396,875,000 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 389,813,000 us-gaap_LongTermDebtNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 389,813,000 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 |  |  |  | 50,606,000 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 67,909,000 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 50,606,000 us-gaap_DeferredTaxLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 50,606,000 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 |  |  |  | 9,962,000 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 9,416,000 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 9,962,000 us-gaap_OtherLiabilitiesNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 9,962,000 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 |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 0 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Liabilities |  |  |  | $ 639,766,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | $ 618,676,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  |  |  | $ 639,766,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember | $ 618,676,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |  | 618,676,000 us-gaap_Liabilities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember |
Whitaker [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Name of Acquired Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Whitaker Medical, LLC |
Business Acquisition, Description of Acquired Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | a provider of physician staffing services headquartered in Houston, Texas |

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