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Earnings (Loss) Per Common Share - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2017 shares
Earnings Per Share [Abstract]
Potentially dilutive shares excluded due to net loss	377,389

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- Definition

Potentially dilutive shares excluded due to net loss.

+ References

No definition available.

+ Details

Name:	fcn_PotentiallyDilutiveSharesExcludedDueToNetLoss
Namespace Prefix:	fcn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration