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Geographical Concentrations that Individually Accounted for 10% or More of Total Revenues Excluding Assets Classified as Held for Sale (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Geographical | Total Revenue | State of Texas      
Concentration Risk [Line Items]      
Concentration risk, percentage [1] 20.60% 20.80% 20.40%
[1] Includes rental income and tenant reimbursements and resident fees and services. Adverse economic developments in this geographical area could significantly impact the Company’s results of operations and cash flows from operations, which in turn would impact its ability to pay debt service and make distributions to stockholders.