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Acquisition of Global Workplace Solutions (GWS) - Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 03, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 13, 2015
Business Acquisition [Line Items] |  |  |  |  |
Senior Notes due date |  | Mar. 01, 2026 |  |  |
Aggregate principal amount issued |  |  |  | $ 595,440 |
Revenue |  | $ 14,209,608 | $ 13,071,589 | 10,855,810 |
Operating income |  | 1,071,442 | 815,487 | 835,944 |
Net income |  | 691,479 | 571,973 | 547,132 |
Direct transaction and integration cost |  | 27,351 | 125,743 | 48,865 |
Amortization expense |  | $ 238,700 | $ 211,700 | $ 175,300 |
4.875% Senior Notes [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate principal amount issued |  |  |  |  | $ 600,000
Interest rate of long-term debt |  | 4.875% | 4.875% | 4.875% | 4.875%
Aggregate principal amount issued |  |  |  | $ 595,440 |
2015 Credit Agreement [Member] | New Tranche B-1 and Tranche B-2 Term Loan Facilities [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Aggregate principal amount issued | $ 400,000 |  |  |  |
Aggregate principal amount issued | $ 400,000 |  |  | 400,000 |
Global Workplace Solutions (GWS) [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Date of business purchase agreement |  | Sep. 01, 2015 |  |  |
Purchase price payable in cash |  | $ 1,475,000 |  |  |
Adjustments for working capital and other items |  | $ 46,500 |  |  |
Revenue |  |  |  | 982,000 |
Operating income |  |  |  | 27,700 |
Net income |  |  |  | 18,800 |
Direct transaction and integration cost |  |  |  | 48,900 |
Amortization expense |  |  |  | 24,200 |
Amortization expense of acquired intangible assets |  |  |  | 47,500 |
Additional interest expense for debt incurred to finance acquisitions |  |  |  | 23,900 |
Removal of direct costs |  |  |  | 48,900 |
Removal of tax impact |  |  |  | $ 48,900 |

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