Quarterly report pursuant to Section 13 or 15(d)

Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Parenthetical) (Detail)

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Mortgages Payable and Debt Maturities - Summary of Debt Obligation and Interest Rate Derivatives (Parenthetical) (Detail)
9 Months Ended
Sep. 30, 2018
Line of credit - variable rate LIBOR + 1.10% (3.28% at September 30, 2018) [Member]  
Debt Instrument [Line Items]  
Interest rate at end of period 3.28%
Basis spread over LIBOR 1.10%
Term note - variable rate LIBOR+1.15% (3.25% at September 30, 2018) [Member]  
Debt Instrument [Line Items]  
Interest rate at end of period 3.25%
Basis spread over LIBOR 1.15%
Term Note - Fixed Rate 5.54% [Member]  
Debt Instrument [Line Items]  
Interest rate 5.54%
Term Note - Fixed Rate 4.533% [Member]  
Debt Instrument [Line Items]  
Interest rate 4.533%
Term Note - Fixed Rate 3.50% [Member]  
Debt Instrument [Line Items]  
Interest rate 3.50%
Term Note - Fixed Rate 3.875% [Member]  
Debt Instrument [Line Items]  
Interest rate 3.875%
Term Note - Fixed Rate 3.67% [Member]  
Debt Instrument [Line Items]  
Interest rate 3.67%
Mortgage Note - Fixed Rate 4.98% [Member]  
Debt Instrument [Line Items]  
Interest rate 4.98%
Mortgage Note - Fixed Rate 4.065% [Member]  
Debt Instrument [Line Items]  
Interest rate 4.065%
Mortgage Note - Fixed Rate 5.26% [Member]  
Debt Instrument [Line Items]  
Interest rate 5.26%
Mortgage Note - Fixed Rate 5.99% [Member]  
Debt Instrument [Line Items]  
Interest rate 5.99%