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Segment Information - Company's Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Operating Statistics [Line Items]      
Total revenues $ 210,837 $ 190,584  
Operating expenses (68,525) (59,236)  
Net operating income (loss) 142,312 131,348  
Depreciation and amortization (68,980) (58,779)  
Interest income 7,877 1,841  
Other income (expense), net (2,901) (1,602)  
Unallocated expenses (75,021) (80,312)  
Equity in net (loss) income of joint ventures 2,954 8,248  
Income from continuing operations 6,241 184  
Total gross real estate assets 8,715,170 8,282,321  
Notes receivable, net 57,558 95,104 68,718
Impairment of joint venture investments 0 (560)  
Shopping Centers [Member]
      
Operating Statistics [Line Items]      
Total revenues 210,832 190,577  
Operating expenses (68,375) (59,103)  
Net operating income (loss) 142,457 131,474  
Depreciation and amortization (68,980) (58,779)  
Equity in net (loss) income of joint ventures (1,330) (659)  
Total gross real estate assets 8,715,170 8,234,810  
Loan Investments [Member]
      
Operating Statistics [Line Items]      
Total revenues 5 7  
Operating expenses (150) (133)  
Net operating income (loss) (145) (126)  
Interest income 7,877 1,841  
Notes receivable, net 236,630 85,611  
Brazil Equity Investment [Member]
      
Operating Statistics [Line Items]      
Equity in net (loss) income of joint ventures 4,284 8,907  
Other [Member]
      
Operating Statistics [Line Items]      
Other income (expense), net (2,901) (1,602)  
Unallocated expenses (75,021) (80,312)  
Total gross real estate assets   47,511  
Notes receivable, net $ (179,072) $ 9,493