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Impairment Charges, Impairment of Joint Venture Investments and Reserves - Impairment Charges on Assets or Investments (Parenthetical) (Detail) - Operating Shopping Centers [Member] - ShoppingCenter | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule Of Investments [Line Items] |  |  |
Number of properties impaired |  | 20 | 25
United States and Puerto Rico [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Number of properties impaired | 27 |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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