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Commitments - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Operating Leased Assets [Line Items] |
Remainder of 2019 | $ 48,430
2020 | 47,477
2021 | 45,689
2022 | 31,090
2023 | 13,726
Thereafter | 14,553
Total | 200,965
Aircraft [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2019 | 45,882
2020 | 45,534
2021 | 44,314
2022 | 29,751
2023 | 12,418
Thereafter | 11,849
Total | 189,748
Other [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2019 | 2,548
2020 | 1,943
2021 | 1,375
2022 | 1,339
2023 | 1,308
Thereafter | 2,704
Total | $ 11,217

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