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Notes Payable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)   $ 3,255,512 $ 2,627,088  
Equity Method Investment, Summarized Financial Information, Noncurrent Liabilities   2,777,162 2,087,552  
Debt Issuance Costs, Net   $ (14,169)    
Debt Instrument, Description of Variable Rate Basis   LIBOR    
Debt Instrument, Collateral Amount   $ 2,000,000    
Maturities of Long-term Debt [Abstract]        
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months   333,373    
Long-term Debt, Maturities, Repayments of Principal in Year Two   413,615    
Long-term Debt, Maturities, Repayments of Principal in Year Three   691,820    
Long-term Debt, Maturities, Repayments of Principal in Year Four   7,058    
Long-term Debt, Maturities, Repayments of Principal in Year Five   7,363    
Thereafter   1,816,452    
Total principal maturities   $ 3,269,681    
Debt covenants and guarantees [Abstract]        
Other Restrictions on Payment of Dividends   0.95    
At 100% [Abstract]        
Capitalized interest, consolidated subsidiaries at 100%   $ 21,864 31,112 $ 27,300
Capitalized interest, unconsolidated joint ventures at 100% (Asia Unconsolidated Joint Venture Construction Loans at Beneficial Interest)   2,589 792  
Interest expense, consolidated subsidiaries at 100%   86,285 63,041 90,803
Interest Expense, unconsolidated joint ventures, at 100%   103,973 85,198  
At beneficial interest [Abstract]        
Debt, consoldiated subsidiaries at beneficial interest   2,949,440 2,468,451  
Debt, unconsolidated joint ventures at beneficial interest   1,425,511 1,116,395  
Capitalized interest, consolidated subsidiaries at beneficial interest   21,728 30,130  
Capitalized interest, unconsolidated joint ventures at beneficial interest   2,589 543  
Interest expense, consolidated subsidiaries at beneficial interest   75,954 56,076  
Interest expense, unconsolidated joint ventures at beneficial interest   54,674 45,564 $ 40,416
Restricted Cash and Cash Equivalents   $ 932 6,447  
Secondary Line of Credit [Member]        
Debt Instrument [Line Item]        
Debt Instrument, Interest Rate Terms   LIBOR + 1.40%    
Debt Instrument, Maturity Date   Apr. 29, 2017    
Line of Credit Facility, Maximum Borrowing Capacity   $ 65,000    
Long-term Line of Credit   24,700    
Line of Credit Facility, Remaining Borrowing Capacity   34,000    
Letters of Credit Outstanding, Amount   $ 6,300    
Line of Credit [Member]        
Debt Instrument [Line Item]        
Debt Instrument, Interest Rate Terms   LIBOR + 1.30%    
Debt Instrument, Maturity Date   Feb. 28, 2019    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,100,000 $ 1,100,000    
Length Of Extension Option   one-year    
Number of Extension Options   1    
Long-term Line of Credit   $ 210,000    
Line of Credit Facility, Remaining Borrowing Capacity   $ 890,000    
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 + 1.45%    
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%    
Cherry Creek Shopping Center [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)   $ 550,000 $ 280,000  
Debt Instrument, Interest Rate, Stated Percentage   3.85% 5.24%  
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 (Notes 1 and 8)   $ 80,269 $ 81,756  
Debt Instrument, Interest Rate, Stated Percentage   4.37%    
Debt Instrument, Maturity Date   Aug. 01, 2023    
The Gardens on El Paseo [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)     $ 81,920  
Debt Instrument, Interest Rate, Stated Percentage     6.10%  
Debt Instrument, Unamortized Premium     $ 400  
Debt Instrument, Maturity Date      
Great Lakes Crossing Outlets [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)   $ 208,303 212,863  
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 (Notes 1 and 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   1    
International Market Place [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)   $ 257,052 92,169  
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   2    
Debt covenants and guarantees [Abstract]        
Unconditional Guaranty Liability, Principal Balance, Percent   100.00%    
Unconditional Guaranty Liability, Interest, Percent   100.00%    
Interest Payable   $ 500    
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 (Notes 1 and 8)     258,250  
Debt Instrument, Interest Rate Terms   LIBOR + 2.00%    
Debt Instrument, Maturity Date   Apr. 02, 2017    
Construction Facility, Maximum Borrowing Capacity   $ 320,000    
Length Of Extension Option   one-year    
Number of Extension Options   2    
Debt covenants and guarantees [Abstract]        
Unconditional Guaranty Liability, Principal Balance, Percent   100.00%    
Unconditional Guaranty Liability, Interest, Percent   100.00%    
Construction Loan   $ 302,357    
Interest Payable   $ 400    
Beneficial Interest in Debt and Interest Expense [Abstract]        
Percentage of noncontrolling interests (in hundredths)   5.00%    
The Mall at Short Hills [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 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    
Derivative, Net Liability Position, Aggregate Fair Value   $ 400    
Debt covenants and guarantees [Abstract]        
Company's Percentage Share of Derivative Guarantee   50.10%    
Interest Payable   $ 200    
Minimum [Member]        
Debt Instrument [Line Item]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
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%    
Maximum [Member]        
Debt Instrument [Line Item]        
Debt Instrument, Basis Spread on Variable Rate 1.90%      
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   0.30%    
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%    
Office Building [Member]        
Debt Instrument [Line Item]        
Notes payable, net (Notes 1 and 8)   $ 12,000 12,000  
Debt Instrument, Interest Rate, Stated Percentage       5.90%
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 (Notes 1 and 8)   $ 3,255,512 2,627,088  
Adjustments for New Accounting Pronouncement [Member]        
Debt Instrument [Line Item]        
Debt Issuance Costs, Net     $ (16,870)  
Subsequent Event [Member]        
Debt Instrument [Line Item]        
Length Of Extension Option six-month      
Number of Extension Options two      
Line of Credit Facility, Maximum Borrowing Capacity Including Accordion Feature $ 2,000,000      
Subsequent Event [Member] | Line of Credit [Member]        
Debt Instrument [Line Item]        
Debt Instrument, Maturity Date, Description February 2021