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Commitments - Schedule of Future Minimum Lease Payments (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ 66,567
2020 47,128
2021 45,681
2022 31,090
2023 13,726
Thereafter 14,553
Total 218,745
Aircraft [Member]  
Operating Leased Assets [Line Items]  
2019 63,993
2020 45,534
2021 44,314
2022 29,751
2023 12,418
Thereafter 11,849
Total 207,859
Other [Member]  
Operating Leased Assets [Line Items]  
2019 2,574
2020 1,594
2021 1,367
2022 1,339
2023 1,308
Thereafter 2,704
Total $ 10,886