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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Consolidated Statements of Operations and Comprehensive Income (Detail) - Interest rate swap contracts [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) recognized in OCI on Derivatives $ (149) $ 96 $ 21
Cash Flow Hedging Relationships [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) recognized in OCI on Derivatives 149 96  
Cash Flow Hedging Relationships [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) recognized in OCI on Derivatives 32 (2)  
Amount of Gain / (Loss) recognized in Income on Derivatives