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Leases - Supplemental Balance Sheet Information Related to Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets    
Operating lease assets $ 1,057,992 $ 997,966
Financing lease assets $ 99,990 $ 94,141
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssets us-gaap:OtherAssets
Total leased assets $ 1,157,982 $ 1,092,107
Current:    
Operating 189,641 168,663
Financing $ 37,780 $ 34,966
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Non-current:    
Operating $ 1,125,005 $ 1,057,758
Financing $ 62,331 $ 60,001
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities $ 1,414,757 $ 1,321,388