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Information on Long-Lived Assets and Net Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Property and equipment, net of accumulated depreciation $ 82,163us-gaap_PropertyPlantAndEquipmentNet $ 79,007us-gaap_PropertyPlantAndEquipmentNet
UNITED STATES    
Segment Reporting Information [Line Items]    
Property and equipment, net of accumulated depreciation 50,914us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
50,351us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_US
Net assets 594,960us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= country_US
504,963us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= country_US
UNITED KINGDOM    
Segment Reporting Information [Line Items]    
Property and equipment, net of accumulated depreciation 21,971us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB
16,931us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= country_GB
Net assets 226,019us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= country_GB
220,951us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= country_GB
All Other Foreign Countries    
Segment Reporting Information [Line Items]    
Property and equipment, net of accumulated depreciation 9,278us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= fcn_AllForeignCountriesMember
11,725us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= fcn_AllForeignCountriesMember
Net assets $ 281,767us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= fcn_AllForeignCountriesMember
$ 316,345us-gaap_AssetsNet
/ us-gaap_StatementGeographicalAxis
= fcn_AllForeignCountriesMember