XML 71 R60.htm IDEA: XBRL DOCUMENT
v3.21.2

Business Combinations - Additional Information (Details) - ITG - Indemnity $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 31, 2020 | Dec. 31, 2022 USD ($) | Sep. 30, 2021 Payment
Business Acquisition [Line Items] |  |  |
Business combination, number of payment outstanding | Payment |  |  | 1
Percentage of fair value acquisition discounting liabilities | 3.25% |  |
Forecast |  |  |
Business Acquisition [Line Items] |  |  |
Purchase price acquisition | $ |  | $ 1.3 |

X
- Definition Business acquisition discount percentage on indemnity liabilities. + References No definition available. + Details
Name: | icfi_BusinessAcquisitionDiscountPercentageOnIndemnityLiabilities
Namespace Prefix: | icfi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Business combination, number of payment outstanding. + References No definition available. + Details
Name: | icfi_BusinessCombinationNumberOfPaymentOutstanding
Namespace Prefix: | icfi_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
Name: | us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=icfi_ITGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=icfi_IndemnityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |