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Fair Value - Information About Our Fixed Rate Financial Instruments Not Measured at Fair Value (Detail) - Level 2 - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed rate debt $ (111,335) $ (109,197)
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fixed rate debt $ (111,205) $ (109,114)