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Fair Value of Financial Instruments - Schedule of Major Categories of Assets / (Liabilities) Measured at Fair Value on Recurring Basis (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Interest rate swap $ (649)
Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Interest rate swap (649)
Interest Rate Swap [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Interest rate swap (649)
Interest Rate Swap [Member] | Level 2 [Member]  
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]  
Interest rate swap $ (649)