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Indebtedness - Additional Information (Detail) - USD ($) $ in Thousands				9 Months Ended
	Oct. 30, 2018	Oct. 11, 2018	Jan. 03, 2018	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Outstanding Principal				$ 968,738	$ 784,640
Unsecured Term Loan
Debt Instrument [Line Items]
Outstanding Principal				$ 100,000	$ 100,000
Subsequent Event | Unsecured Term Loan | KeyBank
Debt Instrument [Line Items]
Maturity date	Jan. 31, 2024
Amount drew down from credit facility	$ 150,000
Weighted Average Maturity (in years)	5 years
Secured credit facility borrowing capacity	$ 200,000
Unsecured credit facility remaining available borrowing capacity	$ 50,000
Subsequent Event | Unsecured Term Loan | KeyBank | LIBOR
Debt Instrument [Line Items]
Debt interest rate	1.45%
Hartshire Lakes
Debt Instrument [Line Items]
Outstanding Principal			$ 16,000
Debt interest rate			4.68%
Interest payment period				monthly
Debt Instrument amortization period			30 years
Maturity date			Jan. 31, 2025
Outstanding Principal, fair value			$ 15,936
Creekside Corners
Debt Instrument [Line Items]
Outstanding Principal			$ 23,500
Debt interest rate			4.56%
Interest payment period				monthly
Debt Instrument amortization period			30 years
Maturity date			Jan. 31, 2025
Outstanding Principal, fair value			$ 23,426
Waterford Landing
Debt Instrument [Line Items]
Interest payment period				monthly
Waterford Landing | Subsequent Event
Debt Instrument [Line Items]
Outstanding Principal		$ 15,500
Debt interest rate		4.82%
Debt Instrument amortization period		30 years
Maturity date		Jan. 31, 2026
Waterford Landing | Subsequent Event | Credit Facility
Debt Instrument [Line Items]
Amount drew down from credit facility		$ 31,000

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, 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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