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Leases - Additional Information Related to Leases (Details) - aircraft | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Sep. 30, 2018
Lessee, Lease, Description [Line Items] |  |  |
Weighted-average remaining lease term - finance leases | 5 years | 5 years |
Weighted-average remaining lease term - operating leases | 10 years | 10 years |
Weighted-average discount rate - finance leases | 50.50% | 6.70% |
Weighted-average discount rate - operating leases | 5.20% | 5.00% |
Embraer ERJ 145 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Number of leased aircraft |  |  | 54

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- Definition Weighted average discount rate for finance lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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