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Activity Related to Liability for Special Charges (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Special Charges [Line Items]
Beginning Balance	$ 11,813
Additions	4,873
Payments	(2,854)
Foreign currency translation adjustment and other	(3)
Ending Balance	13,829
Employee Termination Costs
Special Charges [Line Items]
Beginning Balance	7,768
Additions	4,873
Payments	(2,787)
Foreign currency translation adjustment and other	(3)
Ending Balance	9,851
Lease Termination Costs
Special Charges [Line Items]
Beginning Balance	4,045
Payments	(67)
Ending Balance	$ 3,978

X

- Definition

Special Charges [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Special charges on foreign currency translation adjustment and other.

+ References

No definition available.

+ Details

Name:	fcn_SpecialChargesOnForeignCurrencyTranslationAdjustmentAndOther
Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination and to asset retirement obligations.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Reserve increase representing the amount charged against earnings in the period for a specified incurred and estimated type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of special charge.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_EmployeeSeveranceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: