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, 2017
Dec. 31, 2016
Real Estate [Abstract]    
Estimated Amortization Expense, 2018 $ 1,037  
Estimated Amortization Expense, 2019 978  
Estimated Amortization Expense, 2020 911  
Estimated Amortization Expense, 2021 744  
Estimated Amortization Expense, 2022 516  
Estimated Amortization Expense, Thereafter 1,306  
Estimated Amortization Expense 5,492 $ 2,000
Estimated Net Increase in Rental Revenue, 2018 60  
Estimated Net Increase in Rental Revenue, 2019 62  
Estimated Net Increase in Rental Revenue, 2020 61  
Estimated Net Increase in Rental Revenue, 2021 60  
Estimated Net Increase in Rental Revenue, 2022 33  
Estimated Net Increase in Rental Revenue, Thereafter 401  
Estimated Net Increase to Rental Income $ 677