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Leases - Summary of Lease Portfolio (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Assets      
Operating lease assets $ 4,840 $ 5,798 $ 20,200
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:OtherAssetsNoncurrent us-gaap:OtherAssetsNoncurrent  
Finance leases $ 20,552 $ 20,207  
Finance lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet  
Total lease assets $ 25,392 $ 26,005  
Current      
Operating leases $ 2,092 $ 1,875  
Operating lease, liability, current, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent  
Finance leases $ 510 $ 323  
Long-term      
Operating leases $ 2,946 $ 4,084  
Operating lease, liability, noncurrent, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent  
Finance leases $ 22,338 $ 20,648  
Total lease liabilities $ 27,886 $ 26,930  
Weighted Average Remaining Lease Term      
Operating leases 3 years 7 months 6 days 4 years 2 months 12 days  
Finance leases 18 years 1 month 6 days 20 years 8 months 12 days  
Weighted Average Discount Rate      
Operating leases 2.40% 2.30%  
Finance leases 4.20% 4.40%