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Goodwill and Other Intangible Assets - Schedule of Changes in Goodwill by Segment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | $ 4,049,898 | $ 4,154,503
Accumulated impairment losses | (1,068,506) | (1,068,506)
Goodwill, Net of impairment losses | 2,981,392 | 3,085,997
Purchase accounting entries related to acquisitions | 143,822 | 75,437
Foreign exchange movement | 129,526 | (180,042)
Goodwill Gross, Ending | 4,323,246 | 4,049,898
Accumulated impairment losses | (1,068,506) | (1,068,506)
Goodwill, Net of impairment losses | 3,254,740 | 2,981,392
Americas [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 2,302,929 | 2,260,076
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 1,504,639 | 1,461,786
Purchase accounting entries related to acquisitions | 104,654 | 42,080
Foreign exchange movement | 993 | 773
Goodwill Gross, Ending | 2,408,576 | 2,302,929
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 1,610,286 | 1,504,639
EMEA [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 1,047,295 | 1,172,150
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 908,664 | 1,033,519
Purchase accounting entries related to acquisitions | 17,402 | 36,929
Foreign exchange movement | 91,761 | (161,784)
Goodwill Gross, Ending | 1,156,458 | 1,047,295
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 1,017,827 | 908,664
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 150,706 | 155,875
Goodwill, Net of impairment losses | 150,706 | 155,875
Purchase accounting entries related to acquisitions | 4,198 | (3,922)
Foreign exchange movement | 11,204 | (1,247)
Goodwill Gross, Ending | 166,108 | 150,706
Goodwill, Net of impairment losses | 166,108 | 150,706
Global Investment Management [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 462,305 | 479,739
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 417,383 | 434,817
Purchase accounting entries related to acquisitions | 17,568 | 350
Foreign exchange movement | 25,568 | (17,784)
Goodwill Gross, Ending | 505,441 | 462,305
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 460,519 | 417,383
Development Services [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 86,663 | 86,663
Accumulated impairment losses | (86,663) | (86,663)
Goodwill Gross, Ending | 86,663 | 86,663
Accumulated impairment losses | $ (86,663) | $ (86,663)

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