Commitments and Contingencies - Cash Obligations (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	$ 120,683	$ 120,683
Long-term debt, due in 2020	12,845
Long-term debt, due in 2021	22,758
Long-term debt, due in 2022	23,410
Long-term debt, due in 2023	9,170
Long-term debt, due in 2024	8,890
Long-term debt, due Thereafter	43,610
Operating lease obligations, Total	16,759
Operating lease obligations, due in 2020	4,013
Operating lease obligations, due in 2021	3,977
Operating lease obligations, due in 2022	3,912
Operating lease obligations, due in 2023	2,765
Operating lease obligations, due in 2024	1,105
Operating lease obligations, due Thereafter	987
Total cash obligations	140,635
Total cash obligations, due in 2020	18,522
Total cash obligations, due in 2021	27,965
Total cash obligations, due in 2022	27,621
Total cash obligations, due in 2023	11,935
Total cash obligations, due in 2024	9,995
Total cash obligations, due Thereafter	44,597
Aircraft Notes principal [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	70,000
Long-term debt, due in 2021	7,000
Long-term debt, due in 2022	7,000
Long-term debt, due in 2023	7,000
Long-term debt, due in 2024	7,000
Long-term debt, due Thereafter	42,000
Aircraft Notes interest [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	16,497
Long-term debt, due in 2020	5,647
Long-term debt, due in 2021	2,729
Long-term debt, due in 2022	2,451
Long-term debt, due in 2023	2,170
Long-term debt, due in 2024	1,890
Long-term debt, due Thereafter	1,610
Other Loans principal [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	34,186
Long-term debt, due in 2020	7,198
Long-term debt, due in 2021	13,029
Long-term debt, due in 2022	13,959
Other Loans interest [Member]
Contractual Obligation Fiscal Year Maturity [Line Items]
Long-term debt, Total	3,193
Long-term debt, due in 2020	1,664
Long-term debt, due in 2021	1,230
Long-term debt, due in 2022	$ 299

Contractual Obligation Fiscal Year Maturity [Line Items]

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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Amount of lessee's undiscounted obligation for lease payment for operating lease.

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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