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Indebtedness - Summary Information Concerning Indebtedness (Parenthetical) (Detail) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Outstanding Principal $ 1,013,843,000 $ 991,178,000
Unsecured Credit Facility    
Debt Instrument [Line Items]    
Credit facility borrowing capacity 350,000,000 350,000,000
Outstanding Principal $ 212,802,000 [1] $ 186,302,000 [2]
[1] The unsecured credit facility total capacity is $350,000, of which $212,802 was outstanding as of June 30, 2020. 
[2] The unsecured credit facility total capacity was $350,000, of which $186,302 was outstanding as of December 31, 2019.