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Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2018 USD ($) ShoppingCenter | May 31, 2018 | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2017 $ / shares | Jun. 30, 2018 USD ($) ShoppingCenter JointVenture $ / shares | Jun. 30, 2017 $ / shares | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness |  |  | $ 1,428,025 |  | $ 1,428,025 |  | $ 641,082
Maximum exposure to losses associated with VIEs |  |  | $ 230,300 |  | $ 230,300 |  | $ 284,100
Common share dividends declared per share | $ / shares |  |  | $ 0.38 | $ 0.38 | $ 0.76 | $ 0.76 |
Number of shopping centers leased under ground lease agreements | ShoppingCenter |  |  |  |  | 3 |  |
Common Shares |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reverse stock split |  |  |  |  | one-for-two |  |
Reverse stock split conversion ratio |  | 0.5 |  |  |  |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of unconsolidated joint ventures | JointVenture |  |  |  |  | 2 |  |
Mortgages [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness |  |  | $ 1,270,000 |  | $ 1,270,000 |  |
Retail Value Inc. [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Gross asset value |  |  | 2,700,000 |  | 2,700,000 |  |
Preferred stock, value |  |  | $ 190,000 |  | $ 190,000 |  |
Retail Value Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shopping centers subject to spin off | ShoppingCenter | 48 |  |  |  |  |  |
Gross asset value | $ 2,700,000 |  |  |  |  |  |
Mortgage indebtedness | $ 1,270,000 |  |  |  |  |  |
U.S. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shopping centers subject to spin off | ShoppingCenter | 36 |  |  |  |  |  |
U.S. [Member] | Retail Value Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shopping centers subject to spin off | ShoppingCenter | 36 |  |  |  |  |  |
Puerto Rico [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shopping centers subject to spin off | ShoppingCenter | 12 |  |  |  |  |  |
Puerto Rico [Member] | Retail Value Inc. [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of shopping centers subject to spin off | ShoppingCenter | 12 |  |  |  |  |  |

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