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Commitments and Contingencies - Summary of Remaining Aggregate Lease Commitments Under Operating Leases Having Initial Non-Cancelable Terms in Excess of One Year (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 45,572
2018 40,273
2019 32,985
2020 28,294
2021 26,266
Thereafter 56,340
Total 229,730
Aircraft [Member]  
Operating Leased Assets [Line Items]  
2017 40,560
2018 36,879
2019 30,226
2020 26,387
2021 25,253
Thereafter 56,330
Total 215,635
Other [Member]  
Operating Leased Assets [Line Items]  
2017 5,012
2018 3,394
2019 2,759
2020 1,907
2021 1,013
Thereafter 10
Total $ 14,095