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Fair Value Disclosures - Summary of Carrying Amount and Fair Value of Fixed and Floating Rate Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt instrument outstanding balance $ 39,456 $ 39,393
Unobservable Inputs (Level 3 Inputs) [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt instrument outstanding balance 39,456 39,393
Fair value $ 38,731 $ 38,899