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Maturity of Indebtedness (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
2018	$ 842
2019	5,581
2020	8,726
2021	304,769
2022	124,978
2023	106,972
Thereafter	416,870
Mortgages
Debt Instrument [Line Items]
2018	842
2019	5,581
2020	8,726
2021	103,764
2022	74,978
2023	106,972
Thereafter	316,870
Unsecured Credit Facility
Debt Instrument [Line Items]
2021	201,005
2022	50,000
Unsecured Term Loan
Debt Instrument [Line Items]
Thereafter	$ 100,000

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