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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, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | $ 4,154,503 | $ 3,402,327
Accumulated impairment losses | (1,068,506) | (1,068,506)
Goodwill, Net of impairment losses | 3,085,997 | 2,333,821
Purchase accounting entries related to acquisitions | 75,437 | 859,676
Foreign exchange movement | (180,042) | (107,500)
Goodwill Gross, Ending | 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
Americas [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 2,260,076 | 1,828,135
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 1,461,786 | 1,029,845
Purchase accounting entries related to acquisitions | 42,080 | 434,452
Foreign exchange movement | 773 | (2,511)
Goodwill Gross, Ending | 2,302,929 | 2,260,076
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 1,504,639 | 1,461,786
EMEA [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 1,172,150 | 836,054
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 1,033,519 | 697,423
Purchase accounting entries related to acquisitions | 36,929 | 408,491
Foreign exchange movement | (161,784) | (72,395)
Goodwill Gross, Ending | 1,047,295 | 1,172,150
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 908,664 | 1,033,519
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 155,875 | 151,682
Goodwill, Net of impairment losses | 155,875 | 151,682
Purchase accounting entries related to acquisitions | (3,922) | 16,733
Foreign exchange movement | (1,247) | (12,540)
Goodwill Gross, Ending | 150,706 | 155,875
Goodwill, Net of impairment losses | 150,706 | 155,875
Global Investment Management [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 479,739 | 499,793
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 434,817 | 454,871
Purchase accounting entries related to acquisitions | 350 |
Foreign exchange movement | (17,784) | (20,054)
Goodwill Gross, Ending | 462,305 | 479,739
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 417,383 | 434,817
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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