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Derivative Instruments and Hedging Activities - Effect of Derivative Instruments on Consolidated Statements of Operations and Comprehensive Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) recognized in OCI on Derivatives $ 8 $ (149) $ 96
Interest rate swap contracts [Member] | Cash Flow Hedging Relationships [Member] | Interest Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain / (Loss) recognized in OCI on Derivatives 8 (149)  
Amount of Gain / (Loss) reclassified from Accumulated OCI to Income 121 32  
Amount of Gain / (Loss) recognized in Income on Derivatives $ 0 $ 0