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Leases - Summary of Lease Portfolio (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Assets  
Operating leases $ 6,758
Operating lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:OtherAssetsNoncurrent
Finance leases $ 20,940
Finance lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 27,698
Current  
Operating leases $ 1,764
Operating lease, liability, current, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesCurrent
Finance leases $ 359
Long-term  
Operating leases $ 5,028
Operating lease, liability, noncurrent, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent
Finance leases $ 20,879
Total lease liabilities $ 28,030
Weighted Average Remaining Lease Term  
Operating leases 4 years 8 months 12 days
Finance leases 21 years 4 months 24 days
Weighted Average Discount Rate  
Operating leases 2.48%
Finance leases 4.38%