Annual report pursuant to Section 13 and 15(d)

Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail)

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Real Estate and Intangible Assets - Summary of Estimated Aggregate Amortization Expense and Estimated Net Impact on Rental Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Real Estate [Abstract]    
Estimated Amortization Expense, 2019 $ 959  
Estimated Amortization Expense, 2020 754  
Estimated Amortization Expense, 2021 549  
Estimated Amortization Expense, 2022 341  
Estimated Amortization Expense, 2023 299  
Estimated Amortization Expense, Thereafter 2,784  
Estimated Amortization Expense 5,686 $ 5,492
Estimated Net Increase in Rental Revenue, 2019 113  
Estimated Net Increase in Rental Revenue, 2020 27  
Estimated Net Increase in Rental Revenue, 2021 32  
Estimated Net Increase in Rental Revenue, 2022 33  
Estimated Net Increase in Rental Revenue, 2023 30  
Estimated Net Increase in Rental Revenue, Thereafter 372  
Estimated Net Increase to Rental Income $ 607