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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, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | $ 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
Purchase accounting entries related to acquisitions | 471,204 | 143,822
Foreign exchange movement | (73,635) | 129,526
Goodwill Gross, Ending | 4,720,815 | 4,323,246
Accumulated impairment losses | (1,068,506) | (1,068,506)
Goodwill, Net of impairment losses | 3,652,309 | 3,254,740
Americas [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 2,408,576 | 2,302,929
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 1,610,286 | 1,504,639
Purchase accounting entries related to acquisitions | 450,380 | 104,654
Foreign exchange movement | (1,623) | 993
Goodwill Gross, Ending | 2,857,333 | 2,408,576
Accumulated impairment losses | (798,290) | (798,290)
Goodwill, Net of impairment losses | 2,059,043 | 1,610,286
EMEA [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 1,156,458 | 1,047,295
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 1,017,827 | 908,664
Purchase accounting entries related to acquisitions | 17,838 | 17,402
Foreign exchange movement | (51,753) | 91,761
Goodwill Gross, Ending | 1,122,543 | 1,156,458
Accumulated impairment losses | (138,631) | (138,631)
Goodwill, Net of impairment losses | 983,912 | 1,017,827
Asia Pacific [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 166,108 | 150,706
Goodwill, Net of impairment losses | 166,108 | 150,706
Purchase accounting entries related to acquisitions | 8,096 | 4,198
Foreign exchange movement | (8,556) | 11,204
Goodwill Gross, Ending | 165,648 | 166,108
Goodwill, Net of impairment losses | 165,648 | 166,108
Global Investment Management [Member] |  |
Goodwill [Line Items] |  |
Goodwill Gross, Beginning | 505,441 | 462,305
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 460,519 | 417,383
Purchase accounting entries related to acquisitions | (5,110) | 17,568
Foreign exchange movement | (11,703) | 25,568
Goodwill Gross, Ending | 488,628 | 505,441
Accumulated impairment losses | (44,922) | (44,922)
Goodwill, Net of impairment losses | 443,706 | 460,519
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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