Annual report pursuant to Section 13 and 15(d)

Mortgages Payable and Debt Maturities - Additional Information (Detail)

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Mortgages Payable and Debt Maturities - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
Repayments of mortgage $ 1.4