XML 49 R38.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Segment Reporting (Segment Reporting Information) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ 4,310 |  | $ 8,010 |
Revenues: |  |  |  |  |
Revenues |  | 906,449 | $ 667,048 | 2,470,131 | $ 1,946,889
Gross Profit: |  |  |  |  |
Total Gross Profit |  | 270,172 | 218,315 | 751,755 | 629,396
Operating Income (Loss): |  |  |  |  |
Total Operating Income |  | 74,297 | 60,870 | 185,671 | 163,939
Amortization of Intangible Assets |  | 18,540 | 8,248 | 44,689 | 25,011
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  | 164,000 |  | 319,100 |
Apex |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 589,717 | 517,492 | 1,695,728 | 1,502,462
Gross Profit: |  |  |  |  |
Total Gross Profit |  | 177,831 | 155,783 | 506,146 | 445,925
Operating Income (Loss): |  |  |  |  |
Total Operating Income |  | 71,443 | 59,016 | 192,610 | 162,679
Amortization of Intangible Assets |  | 6,546 | 7,194 | 19,638 | 21,983
Oxford |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 152,701 | 149,556 | 455,222 | 444,427
Gross Profit: |  |  |  |  |
Total Gross Profit |  | 62,712 | 62,532 | 187,321 | 183,471
Operating Income (Loss): |  |  |  |  |
Total Operating Income |  | 15,156 | 16,088 | 39,794 | 39,525
Amortization of Intangible Assets |  | 1,040 | 1,054 | 3,143 | 3,028
ECS |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 164,031 | 0 | 319,181 | 0
Gross Profit: |  |  |  |  |
Total Gross Profit |  | 29,629 | 0 | 58,288 | 0
Operating Income (Loss): |  |  |  |  |
Total Operating Income |  |  | 0 | 8,012 | 0
Amortization of Intangible Assets |  | 10,954 | 0 | 21,908 | 0
Corporate |  |  |  |  |
Operating Income (Loss): |  |  |  |  |
Total Operating Income | [1] | (16,616) | (14,234) | (54,745) | (38,265)
Assignment | Apex |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 575,309 | 506,376 | 1,653,835 | 1,468,976
Assignment | Oxford |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 130,365 | 127,963 | 386,068 | 379,892
Permanent placement | Apex |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 14,408 | 11,116 | 41,893 | 33,486
Permanent placement | Oxford |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 22,336 | 21,593 | 69,154 | 64,535
Fixed-price Contract | ECS |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 48,272 | 0 | 93,034 | 0
Time-and-materials Contract | ECS |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 42,102 | 0 | 91,097 | 0
Cost-plus-fixed-fee Contract | ECS |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | $ 73,657 | $ 0 | $ 135,050 | $ 0
[1] | Corporate expenses primarily consist of consolidated stock-based compensation expense, compensation for corporate employees, acquisition, integration and strategic planning expenses, public company expenses and depreciation expense for corporate assets.

X
- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
Name: | us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
Name: | us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_GrossProfit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_GrossProfitAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationRevenueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=asgn_ApexSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=asgn_OxfordSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=asgn_ECSSegmentMemberDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_CorporateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asgn_RevenueTypeAxis=asgn_AssignmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asgn_RevenueTypeAxis=asgn_PermanentplacementDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asgn_RevenueTypeAxis=us-gaap_FixedPriceContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asgn_RevenueTypeAxis=us-gaap_TimeAndMaterialsContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asgn_RevenueTypeAxis=asgn_CostplusfixedfeeContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |