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Leases - Summary of Lease Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Assets    
Operating leases $ 5,894 $ 20,200
Operating lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:OtherAssetsNoncurrent  
Finance leases $ 20,451  
Finance lease, right-of-use asset, statement of financial position [Extensible List] us-gaap:PropertyPlantAndEquipmentNet  
Total lease assets $ 26,345  
Current    
Operating leases $ 1,798  
Operating lease, liability, current, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesCurrent  
Finance leases $ 293  
Long-term    
Operating leases $ 4,205  
Operating lease, liability, noncurrent, statement of financial position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent  
Finance leases $ 20,767  
Total lease liabilities $ 27,063  
Weighted Average Remaining Lease Term    
Operating leases 4 years 3 months 18 days  
Finance leases 20 years 10 months 24 days  
Weighted Average Discount Rate    
Operating leases 2.45%  
Finance leases 4.38%