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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
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