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Indebtedness - Additional Information (Detail) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 14, 2018 USD ($) Option | Mar. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) ShoppingCenter | Jun. 30, 2017 USD ($) | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage indebtedness |  |  | $ 1,428,025,000 |  |  |  |  |  | $ 641,082,000
Repayments of senior notes |  |  | 924,751,000 | $ 300,000,000 |  |  |  |  |
Repayment of outstanding mortgage debt |  |  | 758,937,000 | $ 74,071,000 |  |  |  |  |
Promissory Notes [Member] | First One-year Extension Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 11.00% |  |  |  |  |  |  |  |
Promissory Notes [Member] | First One-year Extension Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan-to-value ratio | 50.00% |  |  |  |  |  |  |  |
Promissory Notes [Member] | Second One-year Extension Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 12.00% |  |  |  |  |  |  |  |
Promissory Notes [Member] | Second One-year Extension Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Loan-to-value ratio | 45.00% |  |  |  |  |  |  |  |
Mortgages indebtedness [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage indebtedness |  |  | $ 1,270,000,000 |  |  |  |  |  |
Loan Agreement |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt instrument extension options maturity period | 3 years |  |  |  |  |  |  |  |
Minimum percentage distribution of REIT |  |  | 20.00% |  |  |  |  |  |
Prepayment premium amount expected to be paid in future | $ 0 |  |  |  |  |  |  |  |
Loan Agreement | Debt Yield Less Than or Equal to 12.0% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 12.00% |  |  |  |  |  |  |  |
Percentage of property’s net sale proceeds | 100.00% |  |  |  |  |  |  |  |
Allocated loan amount percentage | 110.00% |  |  |  |  |  |  |  |
Loan Agreement | Debt Yield is Greater Than 12.0% But Less Than or Equal to 15.0% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of property’s net sale proceeds | 90.00% |  |  |  |  |  |  |  |
Allocated loan amount percentage | 105.00% |  |  |  |  |  |  |  |
Loan Agreement | Debt Yield Greater Than 15.0% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of property’s net sale proceeds | 80.00% |  |  |  |  |  |  |  |
Allocated loan amount percentage | 100.00% |  |  |  |  |  |  |  |
Loan Agreement | Mortgage-backed Securities [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Interest rate description |  |  | one-month LIBOR plus a spread of 2.91% per annum |  |  |  |  |  |
Loan Agreement | Mortgage-backed Securities [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Specified spread line of credit facility | 2.91% |  |  |  |  |  |  |  |
Loan Agreement | Minimum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 15.00% |  |  |  |  |  |  |  |
Loan Agreement | Minimum [Member] | Debt Yield is Greater Than 12.0% But Less Than or Equal to 15.0% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 12.00% |  |  |  |  |  |  |  |
Loan Agreement | Maximum [Member] | Debt Yield is Greater Than 12.0% But Less Than or Equal to 15.0% [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio | 15.00% |  |  |  |  |  |  |  |
Loan Agreement | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt yield ratio |  |  |  |  | 19.20% | 14.10% | 11.90% | 10.80% |
Loan Agreement | U.S. [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Percentage of property’s net sale proceeds | 100.00% |  |  |  |  |  |  |  |
Loan Agreement | Puerto Rico [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Minimum release price of property's | $ 350,000,000 |  |  |  |  |  |  |  |
Loan Agreement | Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Mortgage indebtedness | $ 1,350,000,000 |  |  |  |  |  |  |  |
Debt instrument maturity date | Feb. 09, 2021 |  |  |  |  |  |  |  |
Debt instrument number of extension options | Option | 2 |  |  |  |  |  |  |  |
Debt instrument extension options maturity period | 1 year |  |  |  |  |  |  |  |
Debt instrument, conditions for extension options | two successive one-year extensions at Borrowers’ option conditioned upon, among other items, (i) an event of default shall not be continuing, (ii) in the case of the first one-year extension option, evidence that the debt yield (as defined and calculated in accordance with the Loan Agreement, but which is the ratio of net operating income of the continental U.S. properties to the outstanding principal amount of the Loan Facility) (the “Debt Yield”) equals or exceeds 11% and the ratio of the outstanding principal amount of the Notes to the value of the continental U.S. properties (based on appraisal values determined at the time of the initial closing) (the “Loan-to-Value Ratio”) is less than or equal to 50%, and (iii) in the case of the second one-year extension option, evidence that the Debt Yield equals or exceeds 12% and the Loan-to-Value Ratio is less than or equal to 45%. |  |  |  |  |  |  |  |
Interest rate description |  |  | one-month LIBOR plus a spread of 3.15% per annum |  |  |  |  |  |
Percentage of increase in debt instrument exercise of first extension option | 0.25% |  |  |  |  |  |  |  |
Percentage of increase in debt instrument exercise of second extension option | 0.25% |  |  |  |  |  |  |  |
Derivative cap interest rate | 3.00% |  |  |  |  |  |  |  |
Debt service coverage ratio | 120.00% |  |  |  |  |  |  |  |
Loan Agreement | Promissory Notes [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Specified spread line of credit facility | 3.15% |  |  |  |  |  |  |  |
Loan Agreement | Promissory Notes [Member] | Default [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Description of event of default |  |  | In the event of a default, the contract rate of interest on the Notes will increase to the lesser of (i) the maximum rate allowed by law, or (ii) the greater of (A) 4% above the interest rate otherwise applicable and (B) the Prime Rate (as defined in the Loan Agreement) plus 1.0%. The Notes contain other terms and provisions that are customary for instruments of this nature. |  |  |  |  |  |
Rate of interest in event of default |  |  | 4.00% |  |  |  |  |  |
Additional interest percentage to prime rate in event of default |  |  | 1.00% |  |  |  |  |  |
Loan Agreement | Promissory Notes [Member] | U.S. [Member] | Minimum [Member] | Tranche One [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Principal amount of notes triggering all sales proceeds to be applied towards repayment of notes | $ 270,000,000 |  |  |  |  |  |  |  |
Loan Agreement | Senior and Junior Tranches of Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Voluntary prepayments of debt |  |  | $ 337,500,000 |  |  |  |  |  |
Loan Agreement | Commercial Real Estate | U.S. [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shopping centers owned | ShoppingCenter |  |  | 36 |  |  |  |  |  |
Loan Agreement | Commercial Real Estate | Puerto Rico [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Shopping centers owned | ShoppingCenter |  |  | 12 |  |  |  |  |  |
Senior Unsecured Notes with Maturity Dates Ranging from July 2018 to February 2025 [Member] | Promissory Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayments of senior notes |  | $ 900,000,000 |  |  |  |  |  |  |
Payment on redemption of senior notes |  | 28,400,000 |  |  |  |  |  |  |
Senior Unsecured Notes with Maturity Dates Ranging from July 2018 to February 2025 [Member] | Mortgages indebtedness [Member] |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Repayment of outstanding mortgage debt |  | 452,500,000 |  |  |  |  |  |  |
Repayment of unsecured term loan |  | $ 200,000,000 |  |  |  |  |  |  |

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