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Investments in Unconsolidated Subsidiaries - Schedule of Condensed Financial Information of Equity Method Investments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Equity Method Investments [Line Items]      
Current assets $ 3,931,111 $ 4,385,869  
Non-current assets 16,578,905 15,548,581  
Assets 20,510,016 19,934,450  
Current liabilities 1,919,955 2,032,227  
Non-current liabilities 4,495,117 4,466,814  
Liabilities 6,415,072 6,499,041  
Non-controlling interests 261,654 83,579  
Revenue 1,524,685 1,392,590 $ 1,426,202
Operating income 906,889 1,425,824 527,871
Net income 679,712 1,254,345 418,751
Global Investment Management [Member]      
Schedule Of Equity Method Investments [Line Items]      
Current assets 824,884 1,304,249  
Non-current assets 16,296,613 15,369,496  
Assets 17,121,497 16,673,745  
Current liabilities 409,014 526,777  
Non-current liabilities 4,423,313 4,354,825  
Liabilities 4,832,327 4,881,602  
Non-controlling interests 261,654 83,579  
Revenue 1,199,641 1,108,125 1,184,573
Operating income 641,150 972,493 209,230
Net income 463,560 833,189 122,560
Development Services [Member]      
Schedule Of Equity Method Investments [Line Items]      
Current assets 3,058,166 2,995,449  
Non-current assets 99,728 102,508  
Assets 3,157,894 3,097,957  
Current liabilities 1,478,461 1,451,239  
Non-current liabilities 67,913 110,649  
Liabilities 1,546,374 1,561,888  
Revenue 124,175 104,816 85,594
Operating income 254,191 427,407 292,141
Net income 204,619 395,697 269,841
Other [Member]      
Schedule Of Equity Method Investments [Line Items]      
Current assets 48,061 86,171  
Non-current assets 182,564 76,577  
Assets 230,625 162,748  
Current liabilities 32,480 54,211  
Non-current liabilities 3,891 1,340  
Liabilities 36,371 55,551  
Revenue 200,869 179,649 156,035
Operating income 11,548 25,924 26,500
Net income $ 11,533 $ 25,459 $ 26,350