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Special Charges - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Income And Expenses [Abstract]
Special charges	$ 3,634	$ 1,750	$ 5,061	$ 10,445	$ 0	$ 16,339

X

- Definition

The charge against earnings in the period, comprised of costs associated with non-recurring activities related to our global branding strategy and other strategic branding decisions, a realignment of our workforce and consolidation of office locations.

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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