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Segment Information - Summary of Information about Company's Reportable Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | $ 257,321 | $ 257,323 | $ 511,744 | $ 516,148 |
Rental operation expenses | (71,864) | (73,826) | (144,906) | (150,181) |
Net operating income (loss) | 185,457 | 183,497 | 366,838 | 365,967 |
Impairment charges |  |  | 0 | (279,021) |
Depreciation and amortization | (97,698) | (99,300) | (194,600) | (202,315) |
Interest income | 9,446 | 7,211 | 18,496 | 14,372 |
Other income (expense), net | 2,081 | 2,368 | 3,854 | (1,060) |
Unallocated expenses | (72,756) | (81,131) | (148,987) | (167,646) |
Equity in net income of joint ventures | 1,117 | 1,642 | 15,538 | 1,703 |
Gain (Loss) on sale and change in control of interests, net | 0 | (6,507) | 0 | 7,772 |
Income (loss) from continuing operations | 27,647 | 7,780 | 61,139 | (260,228) |
Total gross real estate assets | 9,949,961 | 10,180,374 | 9,949,961 | 10,180,374 |
Notes receivable, net | 47,294 | 47,304 | 47,294 | 47,304 | $ 42,534
Operating Segments [Member] | Shopping Center [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 257,310 | 257,283 | 511,727 | 516,053 |
Rental operation expenses | (71,747) | (73,809) | (144,750) | (150,145) |
Net operating income (loss) | 185,563 | 183,474 | 366,977 | 365,908 |
Impairment charges |  |  |  | (279,021) |
Depreciation and amortization | (97,698) | (99,300) | (194,600) | (202,315) |
Equity in net income of joint ventures | 1,117 | 1,642 | 15,538 | 1,703 |
Gain (Loss) on sale and change in control of interests, net |  | (6,507) |  | 7,772 |
Total gross real estate assets | 9,949,961 | 10,180,374 | 9,949,961 | 10,180,374 |
Operating Segments [Member] | Loan Investments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Total revenues | 11 | 40 | 17 | 95 |
Rental operation expenses | (117) | (17) | (156) | (36) |
Net operating income (loss) | (106) | 23 | (139) | 59 |
Interest income | 9,446 | 7,211 | 18,496 | 14,372 |
Notes receivable, net | 447,074 | 355,911 | 447,074 | 355,911 |
Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Other income (expense), net | 2,081 | 2,368 | 3,854 | (1,060) |
Unallocated expenses | (72,756) | (81,131) | (148,987) | (167,646) |
Notes receivable, net | $ (399,780) | $ (308,607) | $ (399,780) | $ (308,607) |

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