Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Summary of Disaggregated Revenues (Detail)

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Summary of Significant Accounting Policies - Summary of Disaggregated Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation Of Revenue [Line Items]                      
Rental income                 $ 690,758 $ 539,554 $ 510,774
Total operating revenues $ 221,159 $ 208,256 $ 187,262 $ 171,887 $ 166,505 $ 156,310 $ 147,013 $ 146,943 788,565 616,771 574,739
Management and Acquisition Fee Income [Member]                      
Disaggregation Of Revenue [Line Items]                      
Operating revenues other than rental income                 22,127 17,407 14,274
Tenant Reinsurance [Member]                      
Disaggregation Of Revenue [Line Items]                      
Operating revenues other than rental income                 58,103 44,742 34,902
Other Operating Income [Member]                      
Disaggregation Of Revenue [Line Items]                      
Operating revenues other than rental income                 $ 17,577 $ 15,068 $ 14,789