Related-Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	$ 3,979	$ 4,545
Operating lease agreements term	April 2010 through January 2020
Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	$ 3,739	4,305
AWAC Aviation Inc [Member] \| Financial Advisory And Management Services [Member]
Related Party Transaction [Line Items]
Monthly recurring fee payable pursuant to service agreement	20
Payment For Management services fee	240	240
Aircraft [Member] \| Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	1,878	1,525
Engines To Support Aircraft Fleet [Member] \| Air Wisconsin [Member]
Related Party Transaction [Line Items]
Payments to related parties pursuant to certain aircraft and engines leases and for other professional services	1,661	$ 2,780
Airframe [Member]
Related Party Transaction [Line Items]
Related party transaction purchases of previously leased airframes	$ 200

Monthly recurring fee payable pursuant to service agreement.

No definition available.

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- Definition

Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

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- Definition

Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 17
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3367-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

+ Details

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Balance Type:	debit
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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