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Maturity of Indebtedness (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2018 $ 3,251
2019 4,660
2020 7,611
2021 156,603
2022 123,757
Thereafter 488,758
Mortgages-Fixed Rate  
Debt Instrument [Line Items]  
2018 3,251
2019 4,660
2020 7,611
2021 102,598
2022 73,757
Thereafter 388,758
Unsecured Credit Facility  
Debt Instrument [Line Items]  
2021 54,005
2022 50,000
Term Loan  
Debt Instrument [Line Items]  
Thereafter $ 100,000