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Segments - Summarized Financial Information by Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 5,925,101 | $ 5,260,954 | $ 16,774,684 | $ 15,046,340
Adjusted EBITDA | 454,630 | 463,408 | 1,373,154 | 1,250,522
Advisory Services [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 2,240,712 | 2,059,359 | 6,254,072 | 5,717,899
Adjusted EBITDA | 345,482 | 295,902 | 942,860 | 801,646
Global Workplace Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 3,555,176 | 3,082,781 | 10,106,543 | 8,945,257
Adjusted EBITDA | 95,209 | 82,810 | 298,948 | 244,626
Real Estate Investments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 129,213 | 118,814 | 414,069 | 383,184
Adjusted EBITDA | $ 13,939 | $ 84,696 | $ 131,346 | $ 204,250

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- Definition Adjusted EBITDA represents earnings before net interest expense, write-off of financing costs on extinguished debt, income taxes, depreciation and amortization, and is further adjusted for the impact of certain cash and non-cash charges related to acquisitions, cost-elimination expenses and certain carried interest incentive compensation (reversal) expense to align with the timing of associated revenue. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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