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Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014	Jun. 06, 2012
Stockholders Equity [Line Items]
Value of shares that have been repurchased and retired during the period		$ 71,130,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue	$ 50,032,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Payment for share repurchase	4,367,000us-gaap_PaymentsForRepurchaseOfCommonStock	66,763,000us-gaap_PaymentsForRepurchaseOfCommonStock	50,032,000us-gaap_PaymentsForRepurchaseOfCommonStock
Stock Repurchase Plan
Stockholders Equity [Line Items]
Board of Directors authorized stock repurchase program					250,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Number of shares that have been repurchased and retired during the period	0us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember	1,956,900us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Average price per share		$ 36.35us-gaap_AcceleratedShareRepurchasesFinalPricePaidPerShare / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Value of shares that have been repurchased and retired during the period		71,100,000us-gaap_StockRepurchasedAndRetiredDuringPeriodValue / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Stock repurchase program, period	2 years
Payment for share repurchase		66,700,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember		4,400,000us-gaap_PaymentsForRepurchaseOfCommonStock / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember
Accrued liability related to repurchase of share	$ 0fcn_AccruedRepurchaseStockPayable / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember	$ 4,400,000fcn_AccruedRepurchaseStockPayable / us-gaap_ShareRepurchaseProgramAxis = fcn_StockRepurchasePlanMember

X

- Definition

Accrued amount for stock repurchase transactions.

+ References

No definition available.

+ Details

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- Definition

Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

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- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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