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Leases - Summary of Lease Portfolio (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Assets  
Operating leases $ 6,353
Operating lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:OtherAssetsNoncurrent
Finance leases $ 20,695
Finance lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 27,048
Current  
Operating leases $ 1,816
Operating lease, liability, current, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesCurrent
Finance leases $ 301
Long-term  
Operating leases $ 4,609
Operating lease, liability, noncurrent, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent
Finance leases $ 20,847
Total lease liabilities $ 27,573
Weighted Average Remaining Lease Term  
Operating leases 4 years 6 months
Finance leases 21 years 2 months 12 days
Weighted Average Discount Rate  
Operating leases 2.46%
Finance leases 4.38%