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Special Charges - Schedule Of Special Charges By Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 7,103	$ 0	$ 7,103
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	6,730	0	6,730
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges	0	373	0	373
Corporate Finance & Restructuring | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	861	0	861
FLC | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	3,484	0	3,484
Economic Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	35	0	35
Technology | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	276	0	276
Strategic Communications | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 2,074	$ 0	$ 2,074

X

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 45
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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