Number of shopping centers leased under ground lease agreements.

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Number of shopping centers subject to spin off.

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Number of unconsolidated joint ventures.

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Summary of significant accounting policies.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of all notes and loans payable (with maturities initially due after one year or beyond the operating cycle if longer).

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Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

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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