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Other Assets, Net - Components of Other Assets (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2018 | Feb. 28, 2018 | Dec. 31, 2017
Other Assets [Line Items] |  |  |  |  |  |  |
Amortization expense | $ 10,100 | $ 16,000 | $ 22,000 | $ 32,600 |  |  |
Mortgage indebtedness | 1,428,025 |  | 1,428,025 |  |  |  | $ 641,082
Interest Rate Cap [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Fair value of interest rate cap | 4,800 |  | 4,800 |  |  |  |
Mortgages indebtedness [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness | 1,270,000 |  | 1,270,000 |  |  |  |
Mortgages indebtedness [Member] | Interest Rate Cap [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Mortgage indebtedness |  |  |  |  | $ 1,350,000 | $ 1,350,000 |
Puerto Rico [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Prepaid tax assets expenses |  |  |  |  |  |  | $ 4,000
Retail Value Inc. [Member] |  |  |  |  |  |  |
Other Assets [Line Items] |  |  |  |  |  |  |
Wrote-off of prepaid tax assets to other income (expense), net | $ 4,000 |  | $ 4,000 |  |  |  |

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