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.

No definition available.

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

Reconciliation of Net Income to Adjusted Segment Earnings before Interest, Taxes, Depreciation and Amortization (Parenthetical) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Special charges	$ 0	$ 0	$ 30,074,000	$ 6,811,000
Unallocated Corporate Expenses
Segment Reporting Information [Line Items]
Special charges			$ 3,244,000