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Leases - Annual Future Minimum Obligations for Operating Leases Other than Arrangements with Commercial Airline Partners (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Leases [Abstract]  
2017 (period from October 1 to December 31) $ 5,005
2018 18,832
2019 17,765
2020 15,718
2021 15,478
Thereafter $ 95,693