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Commitments and Contingencies - Schedule of Future Minimum Annual Commitments Under Non-Lease Contracts (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 208
non-lease future commitment yr2 2,275
non-lease future commitment yr3 2,275
non-lease future commitment yr4 2,275
non-lease future commitment yr5 2,275
non-lease future commitment after 5 31,850
non-lease future commitment total $ 41,158