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Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]        
Net loss $ 754 $ 693 $ 678  
Total recognized in accumulated other comprehensive income $ 754 $ 693 $ 678 $ 678