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Summary of Significant Accounting Policies (Narrative) (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies [Abstract]                
Capitalized computer software $ 2,900              
Amortization expense 100              
Cumulative effect adjustments from changes in accounting standards $ 140,014 $ 116,736 $ 110,749 $ 104,832 $ 111,200 $ 126,023 $ 122,068 $ 109,106