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Revenues Based on Location of Legal Entity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 425,158us-gaap_Revenues	$ 451,178us-gaap_Revenues	$ 454,324us-gaap_Revenues	$ 425,552us-gaap_Revenues	$ 415,998us-gaap_Revenues	$ 414,643us-gaap_Revenues	$ 414,613us-gaap_Revenues	$ 407,178us-gaap_Revenues	$ 1,756,212us-gaap_Revenues	$ 1,652,432us-gaap_Revenues	$ 1,576,871us-gaap_Revenues
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									1,256,046us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	1,208,978us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US	1,171,805us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US
UNITED KINGDOM
Segment Reporting Information [Line Items]
Revenues									232,281us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB	194,614us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB	179,643us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_GB
All Other Foreign Countries
Segment Reporting Information [Line Items]
Revenues									$ 267,885us-gaap_Revenues / us-gaap_StatementGeographicalAxis = fcn_AllForeignCountriesMember	$ 248,840us-gaap_Revenues / us-gaap_StatementGeographicalAxis = fcn_AllForeignCountriesMember	$ 225,423us-gaap_Revenues / us-gaap_StatementGeographicalAxis = fcn_AllForeignCountriesMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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