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Unsecured and Secured Indebtedness - Summary of Unsecured and Secured Indebtedness (Parenthetical) (Detail)
Dec. 31, 2018
Minimum [Member]  
Debt Instrument [Line Items]  
Effective interest rate 3.50%
Maximum [Member]  
Debt Instrument [Line Items]  
Effective interest rate 4.80%