Leases - Summary of Lease Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Assets
Operating leases	$ 5,798	$ 20,200
Operating lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Finance leases	$ 20,207
Finance lease, right-of-use asset, statement of financial position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Total lease assets	$ 26,005
Current
Operating leases	$ 1,875
Operating lease, liability, current, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Finance leases	$ 323
Long-term
Operating leases	$ 4,084
Operating lease, liability, noncurrent, statement of financial position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance leases	$ 20,648
Total lease liabilities	$ 26,930
Weighted Average Remaining Lease Term
Operating leases	4 years 2 months 12 days
Finance leases	20 years 8 months 12 days
Weighted Average Discount Rate
Operating leases	2.33%
Finance leases	4.38%