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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Equity Method Investments [Line Items] |  |
Amounts receivable from joint ventures | $ 35,900 | $ 34,300
Unconsolidated Joint Ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Cash and restricted cash | 355,283 | 467,200
Amounts receivable from joint ventures | 35,900 | 34,300
Sonae Sierra Brasil BV SARL [Member] | Unconsolidated Joint Ventures [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Cash and restricted cash | $ 230,800 | $ 347,900

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