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Leases - Schedule of Undiscounted Cash Flows for Finance and Operating Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Finance Leases    
For the three months ending December 31, 2019 $ 1,926  
2020 7,071  
2021 35,262  
2022 2,386  
2023 1,194  
Thereafter 26,094  
Total minimum lease payments 73,933  
Less: amount of lease payments representing interest 23,473  
Present value of future minimum lease payments 50,460  
Less: Current portion of lease liabilities 6,684 $ 445
Noncurrent lease liabilities 43,776  
Operating Leases    
For the three months ending December 31, 2019 15,052  
2020 58,702  
2021 55,092  
2022 50,379  
2023 46,893  
Thereafter 691,763  
Total minimum lease payments 917,881  
Less: amount of lease payments representing interest 410,977  
Present value of future minimum lease payments 506,904  
Current portion of operating lease liabilities 28,010  
Operating lease liabilities $ 478,894