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Acquisition of Global Workplace Solutions - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 3,045,084 |  | $ 3,085,997
Global Workplace Solutions (GWS) [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Date of business purchase agreement |  | Sep. 01, 2015 |  |
Purchase price paid in cash |  |  | $ 1,475,000 |
Adjustments for working capital and other items |  |  | 46,500 |
Goodwill | $ 858,000 |  | 858,000 |
Goodwill recorded in connection with acquisition deductible for tax purpose | 435,000 |  | 435,000 |
Amortization expense of acquired intangible assets | 17,900 |  | 53,800 |
Additional interest expense for debt incurred to finance acquisitions | 9,700 |  | 30,800 |
Removal of direct costs |  |  | 16,900 |
Removal of tax impact |  |  | 24,900 |
Global Workplace Solutions (GWS) [Member] | Americas [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 406,000 |  | 406,000 |
Global Workplace Solutions (GWS) [Member] | EMEA [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | 438,000 |  | 438,000 |
Global Workplace Solutions (GWS) [Member] | Asia Pacific [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 14,000 |  | $ 14,000 |

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