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Goodwill and Other Intangible Assets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) Business Software | Dec. 31, 2016 USD ($)
Finite Lived Intangible Assets [Line Items] |  |  |
Equity interest acquired | 50.00% |  |
Number of acquisitions completed during the period | Business |  | 11 |
Number of software service acquired | Software |  | 2 |
Goodwill impairment | $ 0 | $ 0 | $ 0
Other intangible assets, net | 1,441,308,000 | 1,399,112,000 |
Other intangible assets, accumulated amortization | 1,180,393,000 | 1,000,738,000 |
Intangible assets | 2,462,066,000 | 2,236,297,000 |
Amortization expense | 258,700,000 | 238,700,000 | $ 211,700,000
Estimated annual amortization expense, 2019 | 208,200,000 |  |
Estimated annual amortization expense, 2020 | 182,200,000 |  |
Estimated annual amortization expense, 2021 | 151,400,000 |  |
Estimated annual amortization expense, 2022 | 134,100,000 |  |
Estimated annual amortization expense, 2023 | 119,900,000 |  |
Customer relationships [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 435,225,000 | 355,642,000 |
Intangible assets, amortization period | 20 years |  |
Intangible assets | $ 843,387,000 | 802,597,000 |
Mortgage servicing rights [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 272,852,000 | 235,626,000 |
Intangible assets, amortization period | 10 years |  |
Intangible assets | $ 697,322,000 | 608,757,000 |
Management contracts [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 135,835,000 | 122,450,000 |
Intangible assets, amortization period | 13 years |  |
Intangible assets | $ 200,251,000 | 203,291,000 |
Non-compete agreements [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | 73,750,000 | 57,358,000 |
Intangible assets | $ 73,750,000 | $ 73,750,000 |
New England Joint Venture [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Equity interest acquired | 50.00% |  |
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 |
Global Workplace Solutions (GWS) [Member] | Trademarks [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible assets, amortization period | 20 years |  |
Intangible assets | $ 280,000,000 |  |
Global Workplace Solutions (GWS) [Member] | Non-compete agreements [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Intangible assets, amortization period | 3 years |  |
Intangible assets | $ 74,000,000 |  |

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