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Transformation Initiatives - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020
Restructuring Cost And Reserve [Line Items] |  |
Costs associated with transformation initiatives | $ 55,374 | $ 55,374
Cost of Revenue [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Costs associated with transformation initiatives | 15,700 | 15,700
Operating, Administrative, and Other [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Costs associated with transformation initiatives | 39,700 | 39,700
Advisory Services [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Costs associated with transformation initiatives | 38,300 | 38,300
Global Workplace Solutions [Member] |  |
Restructuring Cost And Reserve [Line Items] |  |
Costs associated with transformation initiatives | $ 17,100 | $ 17,100

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