XML 145 R68.htm IDEA: XBRL DOCUMENT v3.20.4

Notes Receivable from Employees - Additional information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) note	Dec. 31, 2019 USD ($) note	Dec. 31, 2018 USD ($)
Receivables [Abstract]
Notes outstanding (in notes) | note	320	303
Amortization of forgivable loan expense | $	$ 29.4	$ 26.3	$ 36.4

X

- Definition

Amortization Of Loans To Employees

+ References

No definition available.

+ Details

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

X

- Definition

Number of Notes Receivables Outstanding

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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