XML 100 R87.htm IDEA: XBRL DOCUMENT v3.24.0.1

Segment Reporting - Additional Information (Details)		12 Months Ended
	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_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Billable Professionals, Transferred

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number Of Modified Reportable Segments

+ References

No definition available.

+ Details

Name:	fcn_NumberOfModifiedReportableSegments
Namespace Prefix:	fcn_
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Balance Type:	na
Period Type:	duration

X

- 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

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

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X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fcn_FLCSegmentMember
Namespace Prefix:
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Balance Type:
Period Type: