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Leases - Schedule of Undiscounted Cash Flows for Finance and Operating Leases (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Finance Leases    
For the six months ending December 31, 2019 $ 4,137  
2020 6,938  
2021 35,101  
2022 2,193  
2023 1,063  
Thereafter 26,094  
Total minimum lease payments 75,526  
Less: amount of lease payments representing interest 24,343  
Present value of future minimum lease payments 51,183  
Less: Current portion of lease liabilities 7,095 $ 445
Noncurrent lease liabilities 44,088  
Operating Leases    
For the six months ending December 31, 2019 30,201  
2020 58,325  
2021 54,702  
2022 50,007  
2023 46,511  
Thereafter 708,139  
Total minimum lease payments 947,885  
Less: amount of lease payments representing interest 429,404  
Present value of future minimum lease payments 518,481  
Current portion of operating lease liabilities 27,578  
Operating lease liabilities $ 490,903