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Leases - Schedule of Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Operating leases:    
Operating lease expense $ 106,101 $ 207,338
Finance leases:    
Amortization of leased assets 75,060 132,325
Interest on lease liabilities 26,906 50,467
Total finance lease expense 101,966 182,792
Total lease expense $ 208,067 $ 390,130