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Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Total revenues $ 217,556 $ 227,424 $ 236,187 $ 240,421 $ 240,261 $ 253,800 $ 257,321 $ 254,423 $ 921,588 $ 1,005,805 $ 1,028,071
Rental operation expenses                 (250,917) (277,084) (293,693)
Net operating income                 670,671 728,721 734,378
Impairment charges (280,100)               (340,480) (110,906) (279,021)
Hurricane casualty and impairment loss                 (5,930) 0 0
Depreciation and amortization                 (346,204) (389,519) (402,045)
Interest income                 28,364 37,054 29,213
Other income (expense), net                 (68,003) 3,322 (1,739)
Unallocated expenses                 (290,919) (295,471) (321,395)
Equity in net income (loss) of joint ventures                 8,837 15,699 (3,135)
Impairment of joint venture investments                 0 0 (1,909)
Gain (loss) on sale and change in control of interests, net                 368 (1,087) 7,772
Reserve of preferred equity interests                 (61,000) 0 0
Loss from continuing operations                 (404,296) (12,187) (237,881)
Total gross real estate assets 8,248,003       9,244,058       8,248,003 9,244,058 10,128,199
Notes receivable, net 19,675       49,503       19,675 49,503 42,534
Operating Segments [Member] | Shopping Center [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 921,531 1,005,761 1,027,934
Rental operation expenses                 (250,906) (276,866) (293,578)
Net operating income                 670,625 728,895 734,356
Impairment charges                 (340,480) (110,906) (279,021)
Hurricane casualty and impairment loss                 (5,930)    
Depreciation and amortization                 (346,204) (389,519) (402,045)
Interest income                 0 0 0
Other income (expense), net                 0 0 0
Unallocated expenses                 0 0 0
Equity in net income (loss) of joint ventures                 8,837 15,699 (3,135)
Impairment of joint venture investments                     (1,909)
Gain (loss) on sale and change in control of interests, net                 368 (1,087) 7,772
Reserve of preferred equity interests                 (61,000)    
Loss from continuing operations                 0 0 0
Total gross real estate assets 8,248,003       9,244,058       8,248,003 9,244,058 10,128,199
Notes receivable, net 0       0       0 0 0
Operating Segments [Member] | Loan Investments [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 57 44 137
Rental operation expenses                 (11) (218) (115)
Net operating income                 46 (174) 22
Impairment charges                 0 0 0
Hurricane casualty and impairment loss                 0    
Depreciation and amortization                 0 0 0
Interest income                 28,364 37,054 29,213
Other income (expense), net                 0 0 0
Unallocated expenses                 0 0 0
Equity in net income (loss) of joint ventures                 0 0 0
Impairment of joint venture investments                     0
Gain (loss) on sale and change in control of interests, net                 0 0 0
Reserve of preferred equity interests                 0    
Loss from continuing operations                 0 0 0
Total gross real estate assets 0       0       0 0 0
Notes receivable, net 297,451       442,826       297,451 442,826 437,144
Corporate, Non-Segment [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 0 0 0
Rental operation expenses                 0 0 0
Net operating income                 0 0 0
Impairment charges                 0 0 0
Hurricane casualty and impairment loss                 0    
Depreciation and amortization                 0 0 0
Interest income                 0 0 0
Other income (expense), net                 (68,003) 3,322 (1,739)
Unallocated expenses                 (290,919) (295,471) (321,395)
Equity in net income (loss) of joint ventures                 0 0 0
Impairment of joint venture investments                     0
Gain (loss) on sale and change in control of interests, net                 0 0 0
Reserve of preferred equity interests                 0    
Loss from continuing operations                 0 0 0
Total gross real estate assets 0       0       0 0 0
Notes receivable, net $ (277,776)       $ (393,323)       $ (277,776) $ (393,323) $ (394,610)