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Changes In Acquisition-Related Contingent Consideration Liability (Detail) - Entity [Domain] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition, Contingent Consideration [Line Items]
Beginning balance		$ 6,331	$ 6,903	$ 6,338	$ 13,329
Acquisition	[1]				(4,495)
Accretion of acquisition-related contingent consideration		137	255	371	535
Remeasurement of acquisition-related contingent		(1,675)	(261)	(1,675)	(2,383)
Payments		(421)	(314)	(662)	(378)
Change in amount of contingent consideration		1,538	5	1,304	1,848
Ending balance		$ 4,372	6,601	$ 4,372	6,601
Foreign Currency Translation
Business Acquisition, Contingent Consideration [Line Items]
Change in amount of contingent consideration			$ 18		$ (7)
[1] Includes adjustments during the purchase price allocation period.

X

- Definition

Fair value, as of the period end date, of potential payments under the contingent consideration arrangement including cash and shares.

+ References

No definition available.

+ Details

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X

- Definition

Payment made during the period related to acquisition-related contingent consideration.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Business Acquisition Date Contingent Consideration At Fair Value

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of increase (decrease) in the value of right to a contingent consideration asset.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 50



-Paragraph 4



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 50



-Paragraph 4



-Subparagraph (a)(1)



-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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- Definition

In a business combination achieved in stages, this element represents the amount of loss recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

No definition available.

+ Details

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