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Notes Receivable from Employees - Additional information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) Note	Dec. 31, 2015 USD ($) Note	Dec. 31, 2014 USD ($)
Receivables [Abstract]
Notes outstanding | Note	307	285
Amortization of forgivable loan expense | $	$ 25.6	$ 26.0	$ 32.1

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- 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.

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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