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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Leases [Abstract]    
Right-of-use assets - cost $ 49,903 $ 49,909
Accumulated amortization (15,535) (10,307)
Finance lease right-of-use assets, net 34,368 39,602
Right-of-use assets - cost 2,647 2,736
Accumulated amortization (1,270) (805)
Operating lease right-of-use assets, net 1,377 1,931
Total lease assets 35,745 41,533
Finance lease liabilities 12,279 12,351
Operating lease liabilities 801 983
Finance lease liabilities 31,586 37,610
Operating lease liabilities 572 942
Total lease liabilities $ 45,238 $ 51,886