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Leases (Additional Information) (Detail) - USD ($)
$ in Thousands
Jan. 01, 2019
Sep. 30, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Operating lease right-of-use assets $ 44,900 $ 41,709 $ 41,754
Operating lease liabilities 46,100 $ 42,654 $ 42,815
Deferred gains associated with sale and leaseback transactions $ 5,900    
Weighted-average remaining lease term   9 years  
Weighted-average discount rate   3.25%  
T&L [Member]      
Lessee, Lease, Description [Line Items]      
Operating lease right-of-use assets   $ 3,800