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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Leases [Abstract] |  |
Right-of-use assets - cost | $ 50,220 | $ 49,909
Accumulated amortization | (18,192) | (10,307)
Finance lease right-of-use assets, net | 32,028 | 39,602
Right-of-use assets - cost | 2,796 | 2,736
Accumulated amortization | (1,554) | (805)
Operating lease right-of-use assets, net | 1,242 | 1,931
Total lease assets | 33,270 | 41,533
Finance lease liabilities | 12,311 | 12,351
Operating lease liabilities | 770 | 983
Finance lease liabilities | 28,514 | 37,610
Operating lease liabilities | 472 | 942
Total lease liabilities | $ 42,067 | $ 51,886

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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