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Summary of Acquisitions (Parenthetical) (Detail) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 03, 2017 USD ($) Property | Dec. 31, 2018 USD ($) Property | Dec. 31, 2017 USD ($) Property
Business Acquisition [Line Items] |  |  |
Number of units in real estate properties acquired | Property |  | 2,379 | 2,340
Purchase Price |  | $ 272,948 | $ 243,585
Defeasance costs related to properties acquired | $ 3,624 |  |
Acquisition of Nine-Property Portfolio First Phase Acquisition (HPI Portfolio) |  |  |
Business Acquisition [Line Items] |  |  |
Number of units in real estate properties acquired | Property | 2,352 |  |
Purchase Price | $ 228,144 |  |

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- Definition The number of units in a real estate property acquired. + References No definition available. + Details
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