Quarterly report pursuant to Section 13 or 15(d)

Organization - Summary of Disaggregated Revenues (Detail)

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Organization - Summary of Disaggregated Revenues (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation Of Revenue [Line Items]        
Rental income $ 128,818 $ 124,044 $ 376,334 $ 363,284
Total operating revenues 141,483 135,568 412,585 396,673
Management and Acquisition Fee Income [Member]        
Disaggregation Of Revenue [Line Items]        
Operating revenues other than rental income 2,661 2,478 7,602 7,479
Revenues Related to Tenant Insurance [Member]        
Disaggregation Of Revenue [Line Items]        
Operating revenues other than rental income 5,805 5,833 17,290 16,807
Other Operating Income [Member]        
Disaggregation Of Revenue [Line Items]        
Operating revenues other than rental income $ 4,199 $ 3,213 $ 11,359 $ 9,103