XML 107 R92.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Supplemental Condensed Consolidating Guarantor and Non- Guarantor Financial Information - Additional Information (Detail) | Dec. 31, 2017
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
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
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration