Change In Acquisition-Related Contingent Consideration Liability (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2013
Business Acquisition, Contingent Consideration [Line Items]
Acquisition-related contingent consideration liability	$ 2.5

Business Acquisition Contingent Consideration Reduction Of Liability Due To Elimination of Contingency

No definition available.

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