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