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Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) Business | Dec. 31, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of acquisitions completed during the period | Business |  | 8 |
Goodwill impairment | $ 1,068,506 | $ 1,068,506 | $ 1,068,506
Other intangible assets, net | 1,411,039 | 1,450,469 |
Other intangible assets, accumulated amortization | 771,673 | 589,236 |
Indefinite lived intangible assets excluding goodwill | 176,255 | 180,343 |
Amortizable intangible assets | 2,006,457 | 1,859,362 |
Amortization expense | 211,700 | 175,300 | $ 138,100
Estimated annual amortization expense, 2017 | 206,700 |  |
Estimated annual amortization expense, 2018 | 186,000 |  |
Estimated annual amortization expense, 2019 | 132,900 |  |
Estimated annual amortization expense, 2020 | 111,800 |  |
Estimated annual amortization expense, 2021 | 97,400 |  |
Mortgage servicing rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 180,563 | 133,272 |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 10 years |  |
Amortizable intangible assets | $ 501,087 | 377,995 |
Management contracts [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 99,733 | 87,687 |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 13 years |  |
Indefinite lived intangible assets excluding goodwill | $ 101,355 | 103,143 |
Amortizable intangible assets | 177,014 | 180,099 |
Other amortizable intangible assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 92,871 | 76,779 |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 20 years |  |
Amortizable intangible assets | $ 138,312 | 110,731 |
Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite lived intangible assets excluding goodwill | 56,800 | 56,800 |
Customer relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | $ 270,447 | 195,056 |
Amortizable intangible assets, net servicing income expected to received, Maximum, years | 20 years |  |
Amortizable intangible assets | $ 761,290 | 746,814 |
Trade names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite lived intangible assets excluding goodwill | 18,100 | 20,400 |
Non-compete agreements [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other intangible assets, accumulated amortization | 32,777 | 8,194 |
Amortizable intangible assets | $ 73,750 | 73,750 |
Norland [Member] | Trade names [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortizable intangible assets |  | 35,000 |
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 |
Global Workplace Solutions (GWS) [Member] | Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite lived intangible assets excluding goodwill | $ 280,000 |  |
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 |  |

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