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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												$ 836,000us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	$ (108,000)us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	$ 123,000us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Cash and cash equivalents				31,714,000us-gaap_CashAndCashEquivalentsAtCarryingValue				37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue				31,714,000us-gaap_CashAndCashEquivalentsAtCarryingValue	37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue	27,479,000us-gaap_CashAndCashEquivalentsAtCarryingValue	37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue	17,739,000us-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				28,860,000us-gaap_Cash				35,024,000us-gaap_Cash				28,860,000us-gaap_Cash	35,024,000us-gaap_Cash		35,024,000us-gaap_Cash
Proceeds from Divestiture of Businesses	123,000,000us-gaap_ProceedsFromDivestitureOfBusinesses	28,700,000us-gaap_ProceedsFromDivestitureOfBusinesses	33,700,000us-gaap_ProceedsFromDivestitureOfBusinesses
Receivable in escrow	6,000,000asgn_Receivableinescrow
Gain on sale of discontinued operations, net of income taxes	25,703,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	16,400,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	14,400,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax									0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	30,840,000us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Disposal Group, Including Discontinued Operation, Revenue												137,166,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	153,465,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue	207,770,000us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Disposal Group Including Discontinued Operations Cost of Services												94,848,000asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices	106,728,000asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices	144,701,000asgn_DisposalGroupIncludingDiscontinuedOperationsCostofServices
Disposal Group, Including Discontinued Operation, Gross Profit (Loss)												42,318,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	46,737,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss	63,069,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGrossProfitLoss
Disposal Group, Including Discontinued Operation, Operating Income (Loss)												6,519,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	6,938,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss	19,766,000us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss
Disposal Group, Including Discontinued Operation, Interest Expense												0us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense	(2,456,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense	(4,415,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationInterestExpense
Discontinued Operation, Tax Effect of Discontinued Operation		10,400,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	9,100,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation									2,830,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	1,950,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation	6,161,000us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent				947,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1,282,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1,148,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	312,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	16,089,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1,494,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	690,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	15,099,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	3,689,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2,532,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	9,190,000us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation	14,400,000us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDisposalOfDiscontinuedOperation
Accounts receivable, net of allowance of $4,404 and $2,465, respectively				277,146,000us-gaap_AccountsReceivableNetCurrent				241,905,000us-gaap_AccountsReceivableNetCurrent				277,146,000us-gaap_AccountsReceivableNetCurrent	241,905,000us-gaap_AccountsReceivableNetCurrent		241,905,000us-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				13,308,000us-gaap_PrepaidExpenseCurrent				7,482,000us-gaap_PrepaidExpenseCurrent				13,308,000us-gaap_PrepaidExpenseCurrent	7,482,000us-gaap_PrepaidExpenseCurrent		7,482,000us-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				15,746,000us-gaap_DeferredTaxAssetsNetCurrent				14,374,000us-gaap_DeferredTaxAssetsNetCurrent				15,746,000us-gaap_DeferredTaxAssetsNetCurrent	14,374,000us-gaap_DeferredTaxAssetsNetCurrent		14,374,000us-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				13,370,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent				14,390,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent				13,370,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent	14,390,000asgn_WorkersCompensationandMedicalMalpracticeReceivableCurrent		14,390,000asgn_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				3,121,000us-gaap_OtherAssetsCurrent				3,071,000us-gaap_OtherAssetsCurrent				3,121,000us-gaap_OtherAssetsCurrent	3,071,000us-gaap_OtherAssetsCurrent		3,071,000us-gaap_OtherAssetsCurrent
Disposal Group, Including Discontinued Operation, Other Assets, Current				0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets				(400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets				0us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets	(400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets		(400,000)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherCurrentAssets
Disposal Group, Including Discontinued Operation, Assets, Current				34,353,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent				34,191,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent				34,353,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	34,191,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent		34,191,000us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Assets, Current				385,904,000us-gaap_AssetsCurrent				350,437,000us-gaap_AssetsCurrent				385,904,000us-gaap_AssetsCurrent	350,437,000us-gaap_AssetsCurrent		350,437,000us-gaap_AssetsCurrent
Property and equipment, net				44,311,000us-gaap_PropertyPlantAndEquipmentNet				36,048,000us-gaap_PropertyPlantAndEquipmentNet				44,311,000us-gaap_PropertyPlantAndEquipmentNet	36,048,000us-gaap_PropertyPlantAndEquipmentNet		36,048,000us-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				512,060,000us-gaap_Goodwill				514,426,000us-gaap_Goodwill				512,060,000us-gaap_Goodwill	514,426,000us-gaap_Goodwill	444,084,000us-gaap_Goodwill	514,426,000us-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				250,609,000us-gaap_IntangibleAssetsNetExcludingGoodwill				273,623,000us-gaap_IntangibleAssetsNetExcludingGoodwill				250,609,000us-gaap_IntangibleAssetsNetExcludingGoodwill	273,623,000us-gaap_IntangibleAssetsNetExcludingGoodwill		273,623,000us-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				7,617,000us-gaap_OtherAssetsNoncurrent				8,687,000us-gaap_OtherAssetsNoncurrent				7,617,000us-gaap_OtherAssetsNoncurrent	8,687,000us-gaap_OtherAssetsNoncurrent		8,687,000us-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				73,673,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent				75,588,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent				73,673,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent	75,588,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent		75,588,000us-gaap_DisposalGroupIncludingDiscontinuedOperationAssetsNoncurrent
Assets				1,274,174,000us-gaap_Assets				1,258,809,000us-gaap_Assets				1,274,174,000us-gaap_Assets	1,258,809,000us-gaap_Assets		1,258,809,000us-gaap_Assets
Disposal Group, Including Discontinued Operation, Assets				0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation				0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation				0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation	0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation		0us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperation
Other Long-term Debt, Current				18,250,000us-gaap_OtherLongTermDebtCurrent				10,000,000us-gaap_OtherLongTermDebtCurrent				18,250,000us-gaap_OtherLongTermDebtCurrent	10,000,000us-gaap_OtherLongTermDebtCurrent		10,000,000us-gaap_OtherLongTermDebtCurrent
Accounts payable				7,925,000us-gaap_AccountsPayableCurrent				7,360,000us-gaap_AccountsPayableCurrent				7,925,000us-gaap_AccountsPayableCurrent	7,360,000us-gaap_AccountsPayableCurrent		7,360,000us-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				82,563,000us-gaap_EmployeeRelatedLiabilitiesCurrent				72,246,000us-gaap_EmployeeRelatedLiabilitiesCurrent				82,563,000us-gaap_EmployeeRelatedLiabilitiesCurrent	72,246,000us-gaap_EmployeeRelatedLiabilitiesCurrent		72,246,000us-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				15,564,000asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent				17,123,000asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent				15,564,000asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent	17,123,000asgn_Workerscompensationandmedicalmalpracticeliabilitycurrent		17,123,000asgn_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				340,000us-gaap_AccruedIncomeTaxesCurrent				13,120,000us-gaap_AccruedIncomeTaxesCurrent				340,000us-gaap_AccruedIncomeTaxesCurrent	13,120,000us-gaap_AccruedIncomeTaxesCurrent		13,120,000us-gaap_AccruedIncomeTaxesCurrent
Other current liabilities				20,729,000us-gaap_OtherLiabilitiesCurrent				26,460,000us-gaap_OtherLiabilitiesCurrent				20,729,000us-gaap_OtherLiabilitiesCurrent	26,460,000us-gaap_OtherLiabilitiesCurrent		26,460,000us-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				20,195,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent				21,986,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent				20,195,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	21,986,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent		21,986,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Liabilities, Current				165,566,000us-gaap_LiabilitiesCurrent				168,295,000us-gaap_LiabilitiesCurrent				165,566,000us-gaap_LiabilitiesCurrent	168,295,000us-gaap_LiabilitiesCurrent		168,295,000us-gaap_LiabilitiesCurrent
Long-term Debt, Excluding Current Maturities				396,875,000us-gaap_LongTermDebtNoncurrent				389,813,000us-gaap_LongTermDebtNoncurrent				396,875,000us-gaap_LongTermDebtNoncurrent	389,813,000us-gaap_LongTermDebtNoncurrent		389,813,000us-gaap_LongTermDebtNoncurrent
Deferred income tax liabilities				63,821,000us-gaap_DeferredTaxLiabilitiesNoncurrent				46,789,000us-gaap_DeferredTaxLiabilitiesNoncurrent				63,821,000us-gaap_DeferredTaxLiabilitiesNoncurrent	46,789,000us-gaap_DeferredTaxLiabilitiesNoncurrent		46,789,000us-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				7,937,000us-gaap_OtherLiabilitiesNoncurrent				8,597,000us-gaap_OtherLiabilitiesNoncurrent				7,937,000us-gaap_OtherLiabilitiesNoncurrent	8,597,000us-gaap_OtherLiabilitiesNoncurrent		8,597,000us-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				5,567,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent				5,182,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent				5,567,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	5,182,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent		5,182,000us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
Liabilities				639,766,000us-gaap_Liabilities				618,676,000us-gaap_Liabilities				639,766,000us-gaap_Liabilities	618,676,000us-gaap_Liabilities		618,676,000us-gaap_Liabilities
Disposal Group, Including Discontinued Operation, Liabilities				0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation				0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation				0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	0us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation		0us-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												33,078,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	38,991,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense	42,334,000us-gaap_DisposalGroupIncludingDiscontinuedOperationGeneralAndAdministrativeExpense
Disposal Group Including Discontinued Operations Amortization of Intangible Assets												2,721,000asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets	808,000asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets	969,000asgn_DisposalGroupIncludingDiscontinuedOperationsAmortizationofIntangibleAssets
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax												6,519,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	4,482,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	15,351,000us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Life Sciences Europe [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill				4,079,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember				4,564,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember				4,079,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember	4,564,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember	3,753,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = asgn_LifeSciencesEuropeMember	4,564,000us-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				31,714,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember				37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember				31,714,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember		37,350,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
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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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