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Shareholder Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				6 Months Ended
	Jun. 17, 2019	Mar. 18, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019
Class Of Stock [Line Items]
Dividend declared per share			$ 0.18	$ 0.18	$ 0.18	$ 0.18
Dividends paid			$ 0				$ 209
At-the-market agreement to sell common shares, remaining offer price			$ 109,038				$ 109,038
Limited partnership interest received in exchange for issuance of common stock or cash			0				0
OP Units outstanding			881,107				881,107
ATM Sales Agreement
Class Of Stock [Line Items]
Shares issued			65,704				575,704
Weighted average price per share			$ 12.09				$ 10.80
Net proceeds after deducting commissions			$ 778				$ 6,079
Commissions			$ 16				$ 124
Dividend Declared
Class Of Stock [Line Items]
Declaration date	Jun. 17, 2019	Mar. 18, 2019
Dividend declared per share	$ 0.18	$ 0.18
Payment date	Jul. 25, 2019	Apr. 25, 2019
Record date	Jun. 28, 2019	Mar. 29, 2019
Dividend Declared | Noncontrolling Interests
Class Of Stock [Line Items]
Declaration date	Jun. 17, 2019	Mar. 18, 2019
Dividend declared per share	$ 0.18	$ 0.18
Payment date	Jul. 25, 2019	Apr. 25, 2019
Record date	Jun. 28, 2019	Mar. 29, 2019

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