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Activity Related to Liability for Special Charges (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Special Charges [Line Items]
Beginning Balance	$ 26,061fcn_SpecialChargesReserve	$ 15,213fcn_SpecialChargesReserve
Additions	16,840fcn_SpecialChargesReservePeriodExpense	24,359fcn_SpecialChargesReservePeriodExpense
Payments	(24,212)fcn_SpecialChargesReserveSettledWithCash	(13,106)fcn_SpecialChargesReserveSettledWithCash
Foreign currency translation adjustment and other	(76)fcn_SpecialChargesOnForeignCurrencyTranslationAdjustmentAndOther	(405)fcn_SpecialChargesOnForeignCurrencyTranslationAdjustmentAndOther
Ending Balance	18,613fcn_SpecialChargesReserve	26,061fcn_SpecialChargesReserve
Employee Termination Costs
Special Charges [Line Items]
Beginning Balance	19,965fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	6,696fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Additions	7,260fcn_SpecialChargesReservePeriodExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	23,669fcn_SpecialChargesReservePeriodExpense / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Payments	(13,390)fcn_SpecialChargesReserveSettledWithCash / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(9,995)fcn_SpecialChargesReserveSettledWithCash / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Foreign currency translation adjustment and other	(76)fcn_SpecialChargesOnForeignCurrencyTranslationAdjustmentAndOther / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	(405)fcn_SpecialChargesOnForeignCurrencyTranslationAdjustmentAndOther / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Ending Balance	13,759fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember	19,965fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Lease Termination Costs
Special Charges [Line Items]
Beginning Balance	6,096fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember	8,517fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember
Additions	9,580fcn_SpecialChargesReservePeriodExpense / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember	690fcn_SpecialChargesReservePeriodExpense / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember
Payments	(10,822)fcn_SpecialChargesReserveSettledWithCash / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember	(3,111)fcn_SpecialChargesReserveSettledWithCash / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember
Ending Balance	$ 4,854fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember	$ 6,096fcn_SpecialChargesReserve / us-gaap_RestructuringCostAndReserveAxis = fcn_LeaseTerminationCostsMember

X

- Details

Name:	fcn_SpecialChargesLineItems
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

Name:	fcn_SpecialChargesReserve
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

Name:	fcn_SpecialChargesReservePeriodExpense
Namespace Prefix:	fcn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

X

- Details

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

X

- Details

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