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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, 2019
Dec. 31, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]    
Carrying amount $ 6,326 $ 6,420
Unobservable Inputs (Level 3 Inputs) [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Carrying amount 6,326 6,420
Fair value $ 6,059 $ 6,224