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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)