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Summary of Acquisitions (Parenthetical) (Detail) $ in Thousands		9 Months Ended
	Sep. 03, 2017 USD ($) Property	Sep. 30, 2017 USD ($) Property
Business Acquisition [Line Items]
Units (unaudited) | Property		1,621
Purchase Price		$ 170,154
Defeasance costs related to properties acquired	$ 2,781
Acquisition of Nine-Property Portfolio First Phase Acquisition
Business Acquisition [Line Items]
Units (unaudited) | Property	2,353
Purchase Price	$ 228,144

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Defeasance costs related to properties acquired.

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The number of units in a real estate property acquired.

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Payments to acquire real estate including transaction fees.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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