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Components of Income Tax Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Current $ 6,479 $ 6,558 $ 13,455
Deferred (667) 1,118 (1,664)
Income tax expense $ 5,812 $ 7,676 $ 11,791