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Indebtedness - Additional Information (Detail)			1 Months Ended				9 Months Ended
	Sep. 26, 2017 USD ($) Property	May 01, 2017 USD ($)	Sep. 30, 2017 USD ($) Property	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Sep. 30, 2017 USD ($) Property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt		$ (572,000)					$ (572,000)	$ (558,000)
Proceeds from credit facility	$ 85,000,000			$ 31,250,000	$ 9,000,000		$ 148,190,000	$ 93,501,000
Number of properties acquired | Property	4
Number of property dispositions | Property			3				3
Defeasance mortgage loan related to property disposition							$ 20,586,000
Secured Credit Facility
Debt Instrument [Line Items]
Proceeds from credit facility						$ 22,000,000
Unsecured credit facility									$ 312,500,000
Maturity date		Sep. 17, 2018
Unsecured Credit Facility
Debt Instrument [Line Items]
Unsecured credit facility		$ 300,000,000	$ 300,000,000				$ 300,000,000
Paid down value on unsecured credit facility			$ 117,500,000
Term Loan
Debt Instrument [Line Items]
Unsecured credit facility		$ 50,000,000
Maturity date		May 01, 2022
Term Loan | LIBOR
Debt Instrument [Line Items]
Debt interest rate		1.45%
Revolving Commitment
Debt Instrument [Line Items]
Unsecured credit facility		$ 250,000,000
Maturity date		May 01, 2021
Revolving Commitment | LIBOR
Debt Instrument [Line Items]
Debt interest rate		1.50%

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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-Name Accounting Standards Codification
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Date the credit facility terminates, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Mortgage loan related to property sales in noncash investing and financing activities.

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