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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies [Abstract]        
Cumulative effect adjustments from changes in accounting standards $ 174,891 $ 157,246 $ 110,749 $ 104,832