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Revenue - Summary of Disaggregation of Revenue (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Facility
Dec. 31, 2019
USD ($)
Facility
Dec. 31, 2018
USD ($)
Facility
Disaggregation Of Revenue [Line Items]      
Number of Units | Facility 6,080 6,080 6,080
Resident fees and services $ 280,854 $ 288,344 $ 276,623
Percentage of Revenues 100.00% 100.00% 100.00%
Independent Living      
Disaggregation Of Revenue [Line Items]      
Number of Units | Facility 2,261 2,261 2,261
Resident fees and services $ 72,600 $ 74,300 $ 71,700
Percentage of Revenues 25.90% 25.80% 25.90%
Assisted Living      
Disaggregation Of Revenue [Line Items]      
Number of Units | Facility 2,966 2,966 2,966
Resident fees and services $ 138,100 $ 140,500 $ 137,600
Percentage of Revenues 49.20% 48.70% 49.70%
Memory Care      
Disaggregation Of Revenue [Line Items]      
Number of Units | Facility 853 853 853
Resident fees and services $ 57,700 $ 59,400 $ 54,400
Percentage of Revenues 20.50% 20.60% 19.70%
Other Revenues      
Disaggregation Of Revenue [Line Items]      
Resident fees and services $ 12,500 $ 14,100 $ 12,900
Percentage of Revenues 4.40% 4.90% 4.70%