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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies [Abstract]                
Cumulative effect adjustments from changes in accounting standards $ 196,239 $ 194,689 $ 174,891 $ 157,246 $ 140,014 $ 116,736 $ 110,749 $ 104,832