XML 96 R81.htm IDEA: XBRL DOCUMENT
v3.20.4

Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Federal corporate income tax rate | 21.00% | 21.00% | 21.00% | 35.00%
Deferred tax assets and liabilities income tax rate expected to reverse in future | 26.40% |  |  |
Increase in deferred tax provision for income taxes, including adjustments to valuation allowances |  |  | $ 1,000,000.0 |
Increase in valuation allowance | $ 1,400,000 |  |  |
Increase in cumulative foreign tax credit carryforward | 1,400,000 |  |  |
Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment | $ 100,000 |  |  |
Operating loss carryforwards expiration term | 20 years |  |  |
Deferred tax assets, valuation allowance | $ 6,839,000 | $ 5,374,000 | 5,112,000 | $ 1,636,000
Valuation allowance, deferred tax asset, increase (decrease), amount | 1,465,000 | 262,000 | 3,476,000 |
Unrecognized tax benefits | 811,000 | 0 | $ 216,000 | $ 820,000
Unrecognized tax benefits that would impact effective tax rate | 800,000 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued | 100,000 | 0 |  |
Amount of social security tax deferred payment due to CARES Act | $ 20,900,000 |  |  |
Percentage of social security tax payable in one year | 50.00% |  |  |
International government subsidy payments received | $ 3,000,000.0 |  |  |
Earliest Tax Year | Internal Revenue Service (IRS) |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2017 |  |  |
Earliest Tax Year | State and Foreign Jurisdictions |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2016 |  |  |
Latest Tax Year | Internal Revenue Service (IRS) |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2019 |  |  |
Latest Tax Year | State and Foreign Jurisdictions |  |  |  |
Income Taxes [Line Items] |  |  |  |
Open tax year | 2019 |  |  |
Foreign Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | $ 2,500,000 | 2,500,000 |  |
Deferred tax assets, valuation allowance | 1,000,000.0 | 900,000 |  |
Valuation allowance, deferred tax asset, increase (decrease), amount | 5,800,000 |  |  |
Domestic Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards | $ 7,800,000 |  |  |
Net operating loss carryforwards, expiration year | 2034 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward, amount | $ 2,700,000 |  |  |
Deferred tax assets, tax credit carryforwards | $ 2,108,000 | $ 2,026,000 |  |
State and Local Jurisdiction | Earliest Tax Year |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforwards, expiration year | 2021 |  |  |
State and Local Jurisdiction | Latest Tax Year |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforwards, expiration year | 2029 |  |  |

X
- Definition Amount of deferred social security tax payment pursuant CARES act. + References No definition available. + Details
Name: | icfi_DeferredSocialSecurityTaxPaymentCARESAct
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Income taxes. + References No definition available. + Details
Name: | icfi_IncomeTaxesLineItems
Namespace Prefix: | icfi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Income taxes provided for additional outside basis difference inherent in entities as result of reinvestment. + References No definition available. + Details
Name: | icfi_IncomeTaxesProvidedForAdditionalOutsideBasisDifferenceInherentInEntitiesAsResultOfReinvestment
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition International government coronavirus subsidy payments received. + References No definition available. + Details
Name: | icfi_InternationalGovernmentCoronavirusSubsidyPaymentsReceived
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Expiration term of each operating loss carryforward. + References No definition available. + Details
Name: | icfi_OperatingLossCarryforwardsExpirationTerm
Namespace Prefix: | icfi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating loss carryforwards expiration year. + References No definition available. + Details
Name: | icfi_OperatingLossCarryforwardsExpirationYear
Namespace Prefix: | icfi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of social security tax to be repaid. + References No definition available. + Details
Name: | icfi_PercentageOfSocialSecurityTaxToBeRepaid
Namespace Prefix: | icfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax credit carryforward, expiration date. + References No definition available. + Details
Name: | icfi_TaxCreditCarryforwardExpirationYear
Namespace Prefix: | icfi_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017 complete accounting change in cumulative foreign tax credit carry forward. + References No definition available. + Details
Name: | icfi_TaxCutsAndJobsActOf2017CompleteAccountingChangeInCumulativeForeignTaxCreditCarryForward
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax cuts and jobs act of 2017 complete accounting change in tax rate deferred tax assets and liabilities expected to reverse in future. + References No definition available. + Details
Name: | icfi_TaxCutsAndJobsActOf2017CompleteAccountingChangeInTaxRateDeferredTaxAssetsAndLiabilitiesExpectedToReverseInFuture
Namespace Prefix: | icfi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017 complete accounting change in tax rate deferred tax provisional income tax expense (benefit) including adjustments to valuation allowances. + References No definition available. + Details
Name: | icfi_TaxCutsAndJobsActOf2017CompleteAccountingChangeInTaxRateDeferredTaxProvisionalIncomeTaxExpenseBenefitIncludingAdjustmentsToValuationAllowances
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act of 2017 complete accounting change in valuation allowances for cumulative foriegn tax credit carry forward. + References No definition available. + Details
Name: | icfi_TaxCutsAndJobsActOf2017CompleteAccountingChangeInValuationAllowancesForCumulativeForiegnTaxCreditCarryForward
Namespace Prefix: | icfi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
Name: | us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_OpenTaxYear
Namespace Prefix: | us-gaap_
Data Type: | us-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
Name: | us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=icfi_StateAndForeignJurisdictionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_LatestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_DomesticCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |