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Leases - Schedule of Lease Assets and Related Lease Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
Right-of-use assets - cost $ 49,784  
Accumulated amortization (7,720)  
Finance lease right-of-use assets, net 42,064 $ 0
Right-of-use assets - cost 2,723  
Accumulated amortization (531)  
Operating lease right-of-use assets, net 2,192  
Total lease assets 44,256  
Finance lease liabilities 12,149 0
Operating lease liabilities 998  
Finance lease liabilities 40,713 $ 0
Operating lease liabilities 1,133  
Total lease liabilities $ 54,993