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Fair Value Measurements - Narrative (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Mar. 18, 2021 | Dec. 31, 2020 | Dec. 28, 2020 | Aug. 13, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Investments in unconsolidated subsidiaries at fair value using NAV | $ 113,700 |  | $ 113,700 |  |  | $ 66,300 |  |
Asset impairments | 0 | $ 0 | 0 | $ 75,171 |  |  |  |
Notes payable on real estate | $ 73,600 |  | $ 73,600 |  |  | $ 79,600 |  |
4.875% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Interest rate of long-term debt | 4.875% |  | 4.875% |  |  |  |  | 4.875%
2.5% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Interest rate of long-term debt | 2.50% |  | 2.50% |  | 2.50% | 2.50% |  |
5.25% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Interest rate of long-term debt |  |  |  |  |  |  | 5.25% |
Redemption of debt instrument |  |  |  |  |  |  | $ 425,000 |
Estimated Fair Value |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior term loans | $ 761,600 |  | $ 761,600 |  |  | $ 772,200 |  |
Estimated Fair Value | 4.875% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior notes | 684,000 |  | 684,000 |  |  | 702,500 |  |
Estimated Fair Value | 2.5% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior notes | 505,100 |  | 505,100 |  |  |  |  |
Actual Carrying Value |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior term loans | 760,800 |  | 760,800 |  |  | 785,700 |  |
Actual Carrying Value | 4.875% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior notes | 595,200 |  | 595,200 |  |  | $ 594,500 |  |
Actual Carrying Value | 2.5% Senior Notes | Senior Notes |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Senior notes | $ 487,900 |  | $ 487,900 |  |  |  |  |
Global Workplace Solutions |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Asset impairments |  |  |  | 50,200 |  |  |  |
Real Estate Investments |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Non-cash goodwill impairment charge |  |  |  | $ 25,000 |  |  |  |

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