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Maturity of Indebtedness (Detail) $ in Thousands	Jun. 30, 2018 USD ($)
Debt Instrument [Line Items]
2018	$ 1,679
2019	5,581
2020	8,726
2021	252,769
2022	124,977
2023	106,972
Thereafter	416,870
Mortgages
Debt Instrument [Line Items]
2018	1,679
2019	5,581
2020	8,726
2021	103,764
2022	74,977
2023	106,972
Thereafter	316,870
Unsecured Credit Facility
Debt Instrument [Line Items]
2021	149,005
2022	50,000
Unsecured Term Loans
Debt Instrument [Line Items]
Thereafter	$ 100,000

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