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Fair Value Disclosures - Summary of Carrying Amount and Fair Value of Fixed and Floating Rate Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items]    
Carrying amount $ 5,522 $ 6,995
Level 3    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Carrying amount 5,522 6,995
Fair value $ 5,213 $ 6,820