XML 100 R80.htm IDEA: XBRL DOCUMENT v3.8.0.1
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, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 40,880
2019 34,915
2020 30,714
2021 29,740
2022 27,911
Thereafter 38,909
Total 203,069
Other [Member]  
Operating Leased Assets [Line Items]  
2018 5,157
2019 3,670
2020 3,308
2021 2,468
2022 1,153
Thereafter 9,832
Total 25,588
Aircraft [Member]  
Operating Leased Assets [Line Items]  
2018 35,723
2019 31,245
2020 27,406
2021 27,272
2022 26,758
Thereafter 29,077
Total $ 177,481