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Special Charges - Schedule of Special Charges By Segment (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 40,885,000 | $ 10,445,000 | $ 0
Operating Segments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 37,207,000 | 9,833,000 |
Operating Segments | Corporate Finance & Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 5,440,000 | 0 |
Operating Segments | Forensic and Litigation Consulting |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 12,334,000 | 2,304,000 |
Operating Segments | Economic Consulting |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 6,624,000 | 0 |
Operating Segments | Technology |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 5,057,000 | 7,529,000 |
Operating Segments | Strategic Communications |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | 7,752,000 | 0 |
Unallocated Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Special charges | $ 3,678,000 | $ 612,000 |

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- 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 + Details
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