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Leases - Supplemental Cash Flow Information related to Leases (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases $ 170,405  
Operating cash outflows from finance leases (interest payments) 49,067  
Financing cash outflows from finance leases 142,571 $ 48,182
Leased assets obtained in exchange for new finance lease liabilities 468,723  
Leased assets obtained in exchange for new operating lease liabilities $ 119,267