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Leases - Schedule of Operating Lease Expenses (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Lessee Lease Description [Line Items]  
Total lease costs $ 6,332
Operating and Maintenance [Member]  
Lessee Lease Description [Line Items]  
Total lease costs 3,495
General and Administrative [Member]  
Lessee Lease Description [Line Items]  
Total lease costs $ 2,837