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Goodwill and Other Intangible Assets - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) Business Software | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Oct. 01, 2017 USD ($) | Oct. 01, 2016 USD ($) | Oct. 01, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of acquisitions completed during the period | Business | 11 |  |  |  |  |
Number of software service acquired | Software | 2 |  |  |  |  |
Goodwill impairment | $ 1,068,506,000 | $ 1,068,506,000 | $ 1,068,506,000 | $ 0 | $ 0 | $ 0
Other intangible assets, net | 1,399,112,000 | 1,411,039,000 |  |  |  |
Other intangible assets, accumulated amortization | 1,000,738,000 | 771,673,000 |  |  |  |
Indefinite lived intangible assets excluding goodwill | 163,553,000 | 176,255,000 |  |  |  |
Amortization expense | 238,700,000 | 211,700,000 | 175,300,000 |  |  |
Estimated annual amortization expense, 2018 | 216,200,000 |  |  |  |  |
Estimated annual amortization expense, 2019 | 165,000,000 |  |  |  |  |
Estimated annual amortization expense, 2020 | 138,200,000 |  |  |  |  |
Estimated annual amortization expense, 2021 | 117,000,000 |  |  |  |  |
Estimated annual amortization expense, 2022 | 107,100,000 |  |  |  |  |
Mortgage servicing rights [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization | $ 235,626,000 | 180,563,000 |  |  |  |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 10 years |  |  |  |  |
Management contracts [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization | $ 122,450,000 | 99,733,000 |  |  |  |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 13 years |  |  |  |  |
Indefinite lived intangible assets excluding goodwill | $ 90,503,000 | 101,355,000 |  |  |  |
Other amortizable intangible assets [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization | 164,796,000 | 141,316,000 |  |  |  |
Trademarks [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite lived intangible assets excluding goodwill | 56,800,000 | 56,800,000 |  |  |  |
Customer relationships [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization | $ 355,642,000 | 270,447,000 |  |  |  |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 20 years |  |  |  |  |
Trade names [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite lived intangible assets excluding goodwill | $ 16,250,000 | 18,100,000 |  |  |  |
Non-compete agreements [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Other intangible assets, accumulated amortization | $ 57,358,000 | $ 32,777,000 |  |  |  |
Global Workplace Solutions (GWS) [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 20 years |  |  |  |  |
Amortization expense |  |  | $ 24,200,000 |  |  |
Global Workplace Solutions (GWS) [Member] | Trademarks [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite lived intangible assets excluding goodwill | $ 280,000,000 |  |  |  |  |
Global Workplace Solutions (GWS) [Member] | Non-compete agreements [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 3 years |  |  |  |  |
Indefinite lived intangible assets excluding goodwill | $ 74,000,000 |  |  |  |  |
Interactive Visualization Technologies [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of software service acquired | Software | 1 |  |  |  |  |
Technology Solutions [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of software service acquired | Software | 1 |  |  |  |  |

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