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Fair Value Disclosures - Summary of Carrying Amount and Fair Value of Fixed and Floating Rate Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt instrument outstanding balance $ 39,393 $ 43,704
Unobservable Inputs (Level 3 Inputs) [Member]    
Fair Value, Option, Quantitative Disclosures [Line Items]    
Debt instrument outstanding balance 39,393 43,704
Fair value $ 38,899 $ 44,986