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Unaudited Quarterly Financial Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 475,808us-gaap_SalesRevenueServicesNet | $ 477,391us-gaap_SalesRevenueServicesNet | $ 468,081us-gaap_SalesRevenueServicesNet | $ 438,642us-gaap_SalesRevenueServicesNet | $ 422,906us-gaap_SalesRevenueServicesNet | $ 420,623us-gaap_SalesRevenueServicesNet | $ 407,244us-gaap_SalesRevenueServicesNet | $ 378,154us-gaap_SalesRevenueServicesNet | $ 1,859,922us-gaap_SalesRevenueServicesNet | $ 1,628,927us-gaap_SalesRevenueServicesNet | $ 1,134,614us-gaap_SalesRevenueServicesNet
Gross profit | 153,534us-gaap_GrossProfit | 155,182us-gaap_GrossProfit | 152,203us-gaap_GrossProfit | 136,993us-gaap_GrossProfit | 129,094us-gaap_GrossProfit | 126,398us-gaap_GrossProfit | 120,745us-gaap_GrossProfit | 109,252us-gaap_GrossProfit | 597,912us-gaap_GrossProfit | 485,489us-gaap_GrossProfit | 352,709us-gaap_GrossProfit
Income from continuing operations | 21,790us-gaap_IncomeLossFromContinuingOperations | 22,238us-gaap_IncomeLossFromContinuingOperations | 20,838us-gaap_IncomeLossFromContinuingOperations | 14,147us-gaap_IncomeLossFromContinuingOperations | 17,487us-gaap_IncomeLossFromContinuingOperations | 19,603us-gaap_IncomeLossFromContinuingOperations | 7,510us-gaap_IncomeLossFromContinuingOperations | 10,111us-gaap_IncomeLossFromContinuingOperations | 79,013us-gaap_IncomeLossFromContinuingOperations | 54,711us-gaap_IncomeLossFromContinuingOperations | 37,195us-gaap_IncomeLossFromContinuingOperations
Income from discontinued operations, net of income taxes | (1,317)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (233)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (49)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (230)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 14,923us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 547us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (171)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 14,502us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (1,829)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | (1,039)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | 5,458us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income | 20,473us-gaap_NetIncomeLoss | 22,005us-gaap_NetIncomeLoss | 20,789us-gaap_NetIncomeLoss | 13,917us-gaap_NetIncomeLoss | 32,410us-gaap_NetIncomeLoss | 20,150us-gaap_NetIncomeLoss | 7,339us-gaap_NetIncomeLoss | 24,613us-gaap_NetIncomeLoss | 77,184us-gaap_NetIncomeLoss | 84,512us-gaap_NetIncomeLoss | 42,653us-gaap_NetIncomeLoss
Earnings Per Share, Basic [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.42us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.26us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.37us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.19us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.48us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.02us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.80us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Discontinued operations | $ (0.03)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.28us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.27us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.56us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.11us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Net income | $ 0.39us-gaap_EarningsPerShareBasic | $ 0.41us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.26us-gaap_EarningsPerShareBasic | $ 0.60us-gaap_EarningsPerShareBasic | $ 0.38us-gaap_EarningsPerShareBasic | $ 0.14us-gaap_EarningsPerShareBasic | $ 0.46us-gaap_EarningsPerShareBasic | $ 1.44us-gaap_EarningsPerShareBasic | $ 1.58us-gaap_EarningsPerShareBasic | $ 0.91us-gaap_EarningsPerShareBasic
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Continuing operations | $ 0.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.41us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.26us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.32us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.36us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.14us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.19us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.46us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.00us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.78us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Discontinued operations | $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.27us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.27us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.04)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.55us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.11us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Net income | $ 0.39us-gaap_EarningsPerShareDiluted | $ 0.41us-gaap_EarningsPerShareDiluted | $ 0.38us-gaap_EarningsPerShareDiluted | $ 0.25us-gaap_EarningsPerShareDiluted | $ 0.59us-gaap_EarningsPerShareDiluted | $ 0.37us-gaap_EarningsPerShareDiluted | $ 0.14us-gaap_EarningsPerShareDiluted | $ 0.46us-gaap_EarningsPerShareDiluted | $ 1.42us-gaap_EarningsPerShareDiluted | $ 1.55us-gaap_EarningsPerShareDiluted | $ 0.89us-gaap_EarningsPerShareDiluted
Apex Segment [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,190,052us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 1,059,993us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | 617,844us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember
Gross profit |  |  |  |  |  |  |  |  | $ 335,322us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | $ 294,611us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember | $ 174,968us-gaap_GrossProfit / us-gaap_StatementBusinessSegmentsAxis = asgn_ApexSegmentMember

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