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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Right-of-use assets - cost $ 49,676  
Accumulated amortization (5,140)  
Finance lease right-of-use assets, net 44,536 $ 0
Right-of-use assets - cost 1,212  
Accumulated amortization (273)  
Operating lease right-of-use assets, net 939  
Total lease assets 45,475  
Finance lease liabilities 12,071 0
Operating lease liabilities 591  
Finance lease liabilities 43,780 $ 0
Operating lease liabilities 346  
Total lease liabilities $ 56,788