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Notes Receivable from Employees - Additional information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) numberOfNote	Dec. 31, 2021 USD ($) numberOfNote	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Notes outstanding (in notes) | numberOfNote	365	321
Amortization of forgivable loan expense | $	$ 30.8	$ 34.4	$ 29.4

X

- Definition

Amortization Of Loans To Employees

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No definition available.

+ Details

Name:	fcn_AmortizationOfLoansToEmployees
Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Number of Notes Receivables Outstanding

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No definition available.

+ Details

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

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No definition available.

+ Details

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