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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Leases [Abstract] |  |
Right-of-use assets - cost | $ 50,796 | $ 50,477
Accumulated amortization | (23,485) | (20,871)
Finance lease right-of-use assets, net | 27,311 | 29,606
Right-of-use assets - cost | 7,340 | 3,934
Accumulated amortization | (2,264) | (1,891)
Operating lease right-of-use assets, net | 5,076 | 2,043
Total lease assets | 32,387 | 31,649
Finance lease liabilities | 12,480 | 12,330
Operating lease liabilities | 1,724 | 1,188
Finance lease liabilities | 22,193 | 25,391
Operating lease liabilities | 3,354 | 853
Total lease liabilities | $ 39,751 | $ 39,762

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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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