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Leases - Supplemental Balance Sheet Information Related to Leases (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Assets  
Operating lease assets $ 938,681
Financing lease assets $ 59,638
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent
Total leased assets $ 998,319
Current:  
Operating 185,457
Financing $ 25,007
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent
Non-current:  
Operating $ 969,216
Financing $ 34,348
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent
Total lease liabilities $ 1,214,028