Investment in Joint Ventures - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]
Cash payments for property acquisition				$ 95,819
Payments to acquire businesses and interest in affiliates				$ 10,715
Review Avenue Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage acquired		100.00%
Review Avenue Partners, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment ownership percentage acquired		60.00%		60.00%
Cash payments for property acquisition		$ 46,400
Payoff of mortgage loan		30,000
Payments of transfer tax		700
Payments to acquire businesses and interest in affiliates		$ 10,700		$ 10,700
Sovran HHF, Sovran HHF II, 191 III, SERS, HIERS, Urban Box, McDonald, Merrick, N32, Sanford and Ingram [Member]
Schedule of Equity Method Investments [Line Items]
Management and call center fee earned	$ 2,200		$ 1,900	$ 4,300	$ 3,800
Sovran HHF, Sovran HHF II, 191 III, SERS, HIERS, Urban Box, McDonald, Merrick, N32, Sanford and Ingram [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Management and call center fee as a percentage of revenues				5.00%
Sovran HHF, Sovran HHF II, 191 III, SERS, HIERS, Urban Box, McDonald, Merrick, N32, Sanford and Ingram [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Management and call center fee as a percentage of revenues				7.00%