Mortgages Payable and Debt Maturities - Additional Information (Detail)
$ in Millions
|12 Months Ended|
Dec. 31, 2018
|Debt Disclosure [Abstract]|
|Repayments of mortgage||$ 1.4|
The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef