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Summary of Significant Accounting Policies - Schedule of Recurring Assets and Liabilities Measured at Fair Value (Parenthetical) (Detail)
Sep. 30, 2018
Dec. 31, 2017
Derivatives Fair Value [Line Items]    
Loan rate swapped for fixed interest rate 5.237%  
1-Month LIBOR | Minimum [Member]    
Derivatives Fair Value [Line Items]    
Interest rate cap for loan 2.50% 2.50%
1-Month LIBOR | Maximum [Member]    
Derivatives Fair Value [Line Items]    
Interest rate cap for loan 3.25% 3.25%