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Commitments - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands | Jun. 30, 2018 USD ($)
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Operating Leased Assets [Line Items] |
Remainder of 2018 | $ 18,876
2019 | 65,456
2020 | 47,114
2021 | 45,681
2022 | 31,090
Thereafter | 28,280
Total | 236,497
Aircraft [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2018 | 18,146
2019 | 63,449
2020 | 45,534
2021 | 44,314
2022 | 29,751
Thereafter | 24,267
Total | 225,461
Other [Member] |
Operating Leased Assets [Line Items] |
Remainder of 2018 | 730
2019 | 2,007
2020 | 1,580
2021 | 1,367
2022 | 1,339
Thereafter | 4,013
Total | $ 11,036

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