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Special Charges - Schedule Of Special Charges By Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 30,074,000	$ 0	$ 30,074,000
Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	26,830,000	0	26,830,000
Unallocated Corporate
Restructuring Cost and Reserve [Line Items]
Special charges	0	3,244,000	0	3,244,000
Corporate Finance & Restructuring | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	3,049,000	0	3,049,000
Forensic and Litigation Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	10,445,000	0	10,445,000
Economic Consulting | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	5,910,000	0	5,910,000
Technology | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	0	3,827,000	0	3,827,000
Strategic Communications | Operating Segments
Restructuring Cost and Reserve [Line Items]
Special charges	$ 0	$ 3,599,000	$ 0	$ 3,599,000

X

- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

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- Definition

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+ References

No definition available.

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