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Acquisitions (Acquisitions Costs, by Acquisition) (Details) (USD $) Share data in Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2013 | May 15, 2012 | Sep. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 05, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Maximum earn-out capped |  |  |  |  |  |  | $ 11,000,000 asgn_Contingentconsiderationmaximum |
CyberCoders [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
BusinessCombinationRecognizedGoodwill |  |  |  |  |  |  |  | 69,018,000 asgn_BusinessCombinationRecognizedGoodwill / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember
Effective Date of Acquisition | Dec. 05, 2013 |  |  |  |  |  |  |
Name of Acquired Entity | CyberCoders Holdings, Inc |  |  |  |  |  |  |
Business Acquisition, Description of Acquired Entity | a provider of permanent placement services headquartered in Irvine, California. |  |  |  |  |  |  |
Reason for Business Combination | The primary reason for the acquisition was to expand the Company's permanent placement services. |  |  |  |  |  |  |
Purchase price | 96,600,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |  |  |  |  |  |  |
Cost of acquired entity, cash paid | 93,600,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |  |  |  |  |  |  |
Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out | 3,000,000 asgn_BusinessAcquisitionContingentConsiderationAtFairValueAccruedEarnOut / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | 1,500,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  |  |  |  | 10,300,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember
Maximum earn-out capped |  |  |  |  |  |  |  | 11,000,000 asgn_Contingentconsiderationmaximum / us-gaap_BusinessAcquisitionAxis = asgn_CyberCodersMember
Apex Systems |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
BusinessCombinationRecognizedGoodwill |  |  | 264,590,000 asgn_BusinessCombinationRecognizedGoodwill / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember |  |  |  |  |
Effective Date of Acquisition |  |  | May 15, 2012 |  |  |  |  |
Name of Acquired Entity |  |  | Apex Systems, Inc. |  |  |  |  |
Business Acquisition, Description of Acquired Entity |  |  | a privately-owned provider of information technology staffing headquartered in Richmond, Virginia. |  |  |  |  |
Reason for Business Combination |  |  | The primary reason for the acquisition was to expand the Company's information technology staffing services. |  |  |  |  |
Purchase price |  |  | 610,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember |  |  |  |  |
Cost of acquired entity, cash paid |  |  | 385,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember | 300,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember |  |  |  |
Shares of Company's common stock issued (in shares) |  |  | 14.3 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  |  | $ 9,800,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = asgn_ApexSystemsMember |  |  |
Whitaker [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Effective Date of Acquisition |  |  |  |  |  | Dec. 02, 2013 |  |
Name of Acquired Entity |  |  |  |  |  | Whitaker Medical, LLC |  |
Business Acquisition, Description of Acquired Entity |  |  |  |  |  | a provider of physician staffing services headquartered in Houston, Texas |  |

X
- Definition Business Acquisition Contingent Consideration At Fair Value Accrued Earn-Out + References No definition available. + Details
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Namespace Prefix: | asgn_
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Balance Type: | credit
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- Definition The amount of goodwill recognized as of the acquisition date. + References No definition available. + Details
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Namespace Prefix: | asgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents the maximum amount of consideration which may be paid. + References No definition available. + Details
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Namespace Prefix: | asgn_
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Balance Type: | credit
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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e845-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Acquisition Date -URI http://asc.fasb.org/extlink&oid=6919109 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e848-128460 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Details
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- Definition Name of the acquired entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents a description of the primary reason for the business combination which may consist of general categories such as top-line growth, synergistic benefits, market share, and diversification and the more detailed factors that might apply. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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- Details
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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |