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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule Of Equity Method Investments [Line Items]        
Revenue $ 445,030 $ 309,529 $ 788,229 $ 624,064
Operating income 236,181 242,506 372,389 280,724
Net income 161,828 221,872 255,824 244,207
Global Investment Management [Member]        
Schedule Of Equity Method Investments [Line Items]        
Revenue 361,317 237,907 625,287 505,058
Operating income 206,206 76,410 277,362 91,888
Net income 138,954 60,307 173,291 64,397
Development Services [Member]        
Schedule Of Equity Method Investments [Line Items]        
Revenue 31,329 27,477 54,005 49,003
Operating income 24,560 157,296 83,137 177,857
Net income 17,117 150,055 70,313 166,152
Other [Member]        
Schedule Of Equity Method Investments [Line Items]        
Revenue 52,384 44,145 108,937 70,003
Operating income 5,415 8,800 11,890 10,979
Net income $ 5,757 $ 11,510 $ 12,220 $ 13,658