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Goodwill and Other Intangible Assets - Additional Information (Detail) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 01, 2019 USD ($) | Jan. 01, 2019 Segment | Jun. 12, 2018 USD ($) | Dec. 31, 2019 USD ($) Acquisition | Dec. 31, 2018 USD ($) Acquisition | Dec. 31, 2017 USD ($)
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Global business segments | Segment |  | 3 |  |  |  |
Goodwill impairment |  |  |  | $ 0 | $ 0 | $ 0
Number of in-fill acquisitions completed | Acquisition |  |  |  | 8 | 6 |
Equity interest acquired |  |  |  |  | 50.00% |
Other intangible assets, net |  |  |  | $ 1,379,546,000 | $ 1,441,308,000 |
Other intangible assets, accumulated amortization |  |  |  | 1,358,528,000 | 1,180,393,000 |
Intangible assets |  |  |  | 2,612,936,000 | 2,462,066,000 |
Intangible asset impairment |  |  |  | 89,787,000 |  |
Amortization expense |  |  |  | 225,700,000 | 258,700,000 | $ 238,700,000
Estimated annual amortization expense, 2020 |  |  |  | 167,700,000 |  |
Estimated annual amortization expense, 2021 |  |  |  | 152,200,000 |  |
Estimated annual amortization expense, 2022 |  |  |  | 130,400,000 |  |
Estimated annual amortization expense, 2023 |  |  |  | 113,200,000 |  |
Estimated annual amortization expense, 2024 |  |  |  | 101,800,000 |  |
Customer relationships [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  |  | $ 519,162,000 | 435,225,000 |
Intangible assets, amortization period |  |  |  | 20 years |  |
Intangible assets |  |  |  | $ 857,772,000 | 843,387,000 |
Mortgage servicing rights [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  |  | $ 319,927,000 | 272,852,000 |
Intangible assets, amortization period |  |  |  | 10 years |  |
Intangible assets |  |  |  | $ 803,419,000 | 697,322,000 |
Management contracts [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization |  |  |  | $ 138,891,000 | 135,835,000 |
Intangible assets, amortization period |  |  |  | 13 years |  |
Intangible assets |  |  |  | $ 142,767,000 | 200,251,000 |
FacilitySource [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Date of business purchase agreement |  |  | Jun. 12, 2018 |  |  |
Final purchase price paid in cash |  |  | $ 266,500,000 |  |  |
Purchase price payable in cash |  |  |  | $ 3,500,000 | $ 263,000,000.0 |
New England Joint Venture [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Equity interest acquired |  |  |  |  | 50.00% |
Telford Homes Plc [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Date of business purchase agreement | Oct. 01, 2019 |  |  |  |  |
Final purchase price paid in cash | $ 328,502,000 |  |  |  |  |
Intangible assets | 26,749,000 |  |  |  |  |
Telford Homes Plc [Member] | Trademarks [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets | $ 26,749,000 |  |  |  |  |
Acquired finite-lived intangible assets | 20 years |  |  |  |  |
Global Workplace Solutions (GWS) [Member] | Trademarks [Member] |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets, amortization period |  |  |  | 20 years |  |
Intangible assets |  |  |  | $ 280,000,000 |  |

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