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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 |

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