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v3.24.0.1

Segment Reporting - Additional Information (Details) |  | 12 Months Ended
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Jul. 01, 2023 segment | Dec. 31, 2023 numberOfProfessional segment
Segment Reporting Information [Line Items] |  |
Number of reportable business segments | segment |  | 5
Number of modified reportable segments | segment | 2 |
Corporate Finance Segment |  |
Segment Reporting Information [Line Items] |  |
Number of billable professionals, transferred | numberOfProfessional |  | 127
FLC Segment |  |
Segment Reporting Information [Line Items] |  |
Number of billable professionals | numberOfProfessional |  | 83

X
- Definition Number Of Billable Professionals + References No definition available. + Details
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Namespace Prefix: | fcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Billable Professionals, Transferred + References No definition available. + Details
Name: | fcn_NumberOfBillableProfessionalsTransferred
Namespace Prefix: | fcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Number Of Modified Reportable Segments + References No definition available. + Details
Name: | fcn_NumberOfModifiedReportableSegments
Namespace Prefix: | fcn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
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Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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