Interest Rate Swaps - Summary of Interest-rate Swap Agreements (Parenthetical) (Detail) - Interest Rate Swap - M&T Bank - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Derivative [Line Items] | ||
| Notional Amount | $ 4,912,000 | $ 5,051,000 |
| Umbrella Partnership Real Estate Investment Trust Transaction | ||
| Derivative [Line Items] | ||
| Interest rate swap assumed month and year | 2017-10 |