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Supplemental Condensed Consolidating Guarantor and Non- Guarantor Financial Information - Additional Information (Detail)	Sep. 30, 2015
Quarterly Financial Information [Line Items]
Guarantors Subsidiary ownership percentage	100.00%

X

- Definition

Ownership Percentage Of Guarantor Subsidiary

+ References

No definition available.

+ Details

Name:	fcn_OwnershipPercentageOfGuarantorSubsidiary
Namespace Prefix:	fcn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Quarterly Financial Information [Line Items]

+ References

No definition available.

+ Details

Name:	fcn_QuarterlyFinancialInformationLineItems
Namespace Prefix:	fcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration