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Leases (Supplemental Balance Sheet Information) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]      
Operating lease right-of-use assets $ 41,709 $ 41,754 $ 44,900
Operating lease liabilities $ 42,654 $ 42,815 $ 46,100
Operating lease, liability, statement of financial position [Extensible List] us-gaap:OtherLiabilities    
Operating lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:OtherAssets