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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]      
Assets $ 18,445,744 $ 10,726,040  
Liabilities 7,009,846 4,898,324  
Non-controlling interests 31,265 1,238  
Revenue 1,426,202 816,764 $ 1,099,674
Operating income (loss) 527,871 (132,415) (212,867)
Net income (loss) 418,751 (210,321) (234,206)
Global Investment Management [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 1,787,277 922,015  
Non-current assets 13,711,080 7,362,818  
Assets 15,498,357 8,284,833  
Current liabilities 1,237,589 239,077  
Non-current liabilities 4,402,376 3,540,059  
Liabilities 5,639,965 3,779,136  
Revenue 1,184,573 585,495 894,725
Operating income (loss) 209,230 (414,538) (307,133)
Net income (loss) 122,560 (481,405) (320,206)
Development Services [Member]      
Schedule of Equity Method Investments [Line Items]      
Real estate 2,629,606 2,184,509  
Other assets 209,997 173,808  
Assets 2,839,603 2,358,317  
Notes payable on real estate 1,046,440 809,163  
Other liabilities 275,150 266,735  
Liabilities 1,321,590 1,075,898  
Revenue 85,594 62,191 39,753
Operating income (loss) 292,141 251,557 63,181
Net income (loss) 269,841 240,034 54,468
Other [Member]      
Schedule of Equity Method Investments [Line Items]      
Current assets 69,466 58,160  
Non-current assets 38,318 24,730  
Assets 107,784 82,890  
Current liabilities 46,623 39,940  
Non-current liabilities 1,668 3,350  
Liabilities 48,291 43,290  
Non-controlling interests 31,265 1,238  
Revenue 156,035 169,078 165,196
Operating income (loss) 26,500 30,566 31,085
Net income (loss) $ 26,350 $ 31,050 $ 31,532