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Commitments - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands | Mar. 31, 2019 USD ($)
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Operating Leased Assets [Line Items] |
Remainder of 2019 | $ 29,277
2020 | 47,497
2021 | 45,689
2022 | 31,090
2023 | 13,726
Thereafter | 14,553
Total | 181,832
Aircraft [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2019 | 27,619
2020 | 45,534
2021 | 44,314
2022 | 29,751
2023 | 12,418
Thereafter | 11,849
Total | 171,485
Other [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2019 | 1,658
2020 | 1,963
2021 | 1,375
2022 | 1,339
2023 | 1,308
Thereafter | 2,704
Total | $ 10,347

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