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Leases - Supplemental Balance Sheet Information Related to Leases (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Assets  
Operating lease assets $ 980,337
Financing lease assets $ 80,304
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent
Total leased assets $ 1,060,641
Current:  
Operating 162,866
Financing $ 30,562
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent
Non-current:  
Operating $ 1,039,865
Financing $ 50,204
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities $ 1,283,497