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Notes Payable, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 3,555,228 $ 3,255,512  
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities 2,860,384 2,777,162  
Debt Issuance Costs, Net (12,484) (14,169)  
Debt Instrument, Collateral Amount 1,600,000    
Maturities of Long-term Debt [Abstract]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 470,019    
Long-term Debt, Maturities, Repayments of Principal in Year Two 481,820    
Long-term Debt, Maturities, Repayments of Principal in Year Three 7,058    
Long-term Debt, Maturities, Repayments of Principal in Year Four 492,363    
Long-term Debt, Maturities, Repayments of Principal in Year Five 307,652    
Thereafter 1,808,800    
Total principal maturities $ 3,567,712    
Debt covenants and guarantees [Abstract]      
Other Restrictions on Payment of Dividends 0.95    
At 100% [Abstract]      
Capitalized interest, consolidated subsidiaries at 100% $ 12,402 21,864 $ 31,100
Capitalized interest, unconsolidated joint ventures at 100% (Asia Unconsolidated Joint Venture Construction Loans at Beneficial Interest) 456 2,589  
Interest expense, consolidated subsidiaries at 100% 108,572 86,285 63,041
Interest Expense, unconsolidated joint ventures, at 100% 130,339 103,973  
At beneficial interest [Abstract]      
Debt, consoldiated subsidiaries at beneficial interest 3,261,777 2,949,440  
Debt, unconsolidated joint ventures at beneficial interest 1,459,854 1,425,511  
Capitalized interest, consolidated subsidiaries at beneficial interest 12,326 21,728  
Capitalized interest, unconsolidated joint ventures at beneficial interest 456 2,589  
Interest expense, consolidated subsidiaries at beneficial interest 96,630 75,954  
Interest expense, unconsolidated joint ventures at beneficial interest $ 67,283 54,674 $ 45,564
Secondary Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Interest Rate Terms LIBOR + 1.40%    
Debt Instrument, Maturity Date Apr. 28, 2018    
Line of Credit Facility, Maximum Borrowing Capacity $ 65,000    
Long-term Line of Credit 19,655 24,700  
Line of Credit Facility, Remaining Borrowing Capacity 40,800    
Letters of Credit Outstanding, Amount $ 4,600    
Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Interest Rate Terms LIBOR + 1.45%    
Debt Instrument, Maturity Date Feb. 01, 2021    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000    
Length Of Extension Option six-month    
Number of Extension Options two    
Long-term Line of Credit $ 485,000 210,000  
Line of Credit Facility, Remaining Borrowing Capacity 499,300    
Line of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature $ 2,000,000    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Unsecured Debt [Member]      
Debt Instrument [Line Item]      
Unsecured Debt $ 475,000 475,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.60%    
Debt Instrument, Maturity Date Feb. 28, 2019    
Line of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature $ 600,000    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Derivative, Fixed Interest Rate 1.65%    
Unsecured Debt Secondary Term Loan [Member]      
Debt Instrument [Line Item]      
Unsecured Debt $ 300,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.60%    
Debt Instrument, Maturity Date Feb. 01, 2022    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Derivative, Fixed Interest Rate 2.14%    
Cherry Creek Shopping Center [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 550,000 550,000  
Debt Instrument, Interest Rate, Stated Percentage 3.85%    
Debt Instrument, Maturity Date Jun. 01, 2028    
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 50.00%    
City Creek Center [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 78,703 80,269  
Debt Instrument, Interest Rate, Stated Percentage 4.37%    
Debt Instrument, Maturity Date Aug. 01, 2023    
Great Lakes Crossing Outlets [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 203,553 208,303  
Debt Instrument, Interest Rate, Stated Percentage 3.60%    
Debt Instrument, Maturity Date Jan. 06, 2023    
The Mall at Green Hills [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 150,000 150,000  
Debt Instrument, Interest Rate Terms LIBOR+1.60%    
Debt Instrument, Maturity Date Dec. 01, 2018    
Length Of Extension Option one-year    
Number of Extension Options two    
International Market Place [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 293,801 257,052  
Debt Instrument, Interest Rate Terms LIBOR + 1.75%    
Debt Instrument, Maturity Date Aug. 14, 2018    
Construction Facility, Maximum Borrowing Capacity $ 330,890    
Length Of Extension Option one-year    
Number of Extension Options two    
Debt covenants and guarantees [Abstract]      
Unconditional Guaranty Liability, Principal Balance, Percent 100.00%    
Unconditional Guaranty Liability, Interest, Percent 100.00%    
Interest Payable $ 800    
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 6.50%    
The Mall of San Juan [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8)   $ 302,357  
Debt Instrument, Interest Rate Terms   LIBOR + 2.00%  
Debt covenants and guarantees [Abstract]      
Construction Loan $ 302,400  
Beneficial Interest in Debt and Interest Expense [Abstract]      
Percentage of noncontrolling interests (in hundredths) 5.00%    
International Market Place and The Mall at Green Hills [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 443,800    
Length Of Extension Option one-year    
Number of Extension Options two    
The Mall at Short Hills [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 1,000,000 1,000,000  
Debt Instrument, Interest Rate, Stated Percentage 3.48%    
Debt Instrument, Maturity Date Oct. 01, 2027    
International Plaza [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Face Amount $ 175,000    
Debt covenants and guarantees [Abstract]      
Company's Percentage Share of Derivative Guarantee 50.10%    
Interest Payable $ 100    
Minimum [Member] | Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.15%    
Line of Credit Facility, Commitment Fee Percentage 0.20%    
Minimum [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.35%    
Total Swapped Rate On Loan 3.00%    
Minimum [Member] | Unsecured Debt Secondary Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.25%    
Total Swapped Rate On Loan 3.39%    
Maximum [Member] | Line of Credit [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.70%    
Line of Credit Facility, Commitment Fee Percentage 0.25%    
Maximum [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Total Swapped Rate On Loan 3.55%    
Maximum [Member] | Unsecured Debt Secondary Term Loan [Member]      
Debt Instrument [Line Item]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Total Swapped Rate On Loan 4.04%    
Office Building [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 12,000 12,000  
Debt Instrument, Interest Rate Terms LIBOR + 1.40% Swapped to 3.49%    
Debt Instrument, Maturity Date Mar. 01, 2024    
Consolidated Properties [Member]      
Debt Instrument [Line Item]      
Notes payable, net (Note 8) $ 3,555,228 $ 3,255,512