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Leases - Additional Information (Details) $ in Millions	Jun. 25, 2021 USD ($) item agreement	Nov. 30, 2018 subsidiary	Oct. 25, 2018 subsidiary	Jun. 28, 2018	Jun. 26, 2018 subsidiary	Jan. 30, 2018 USD ($) subsidiary	May 30, 2017 USD ($) subsidiary	Sep. 30, 2021 facility	Sep. 30, 2021 item
Number Of Finance Lease Facility								5	7
Number of vessel in operation | item									14
Number of short term lease agreements | agreement	2
Lease, Practical Expedients, Package [true false]	true
Japanese Leases No.1 and 2 [Member]
Number of subsidiaries | subsidiary							2
Sellers Credit Note | $							$ 2.9
Japanese Leases No.1 and 2 [Member] | Other Noncurrent Assets [Member] | Finance Liability [Member]
Sellers Credit Note | $							$ 2.9
Japanese Lease No.3 [Member]
Number of subsidiaries | subsidiary						1
Sellers Credit Note | $						$ 1.4
Japanese Lease No.3 [Member] | Finance Liability [Member]
Sellers Credit Note | $						$ 1.4
Japanese Lease No.4 [Member]
Number of subsidiaries | subsidiary		1
Finance Lease Expiry Period		2029
Debt Instrument, Basis Spread on Variable Rate		3.20%
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 3.20%
CMBFL Leases No.1 to 4 [Member]
Number of subsidiaries | subsidiary			2		2
Finance Lease Expiry Period			2025
Debt Instrument, Basis Spread on Variable Rate			3.00%	3.10%
Debt Instrument, Description of Variable Rate Basis			LIBOR plus 3.00%
Ocean Yield ASA [Member]
Number of subsidiaries | subsidiary			2
Finance Lease Expiry Period			2030
Debt Instrument, Basis Spread on Variable Rate			4.50%
Debt Instrument, Description of Variable Rate Basis			LIBOR plus 4.50%
China Huarong Leases [Member]
Number of subsidiaries | subsidiary		2
Finance Lease Expiry Period		2025
Debt Instrument, Basis Spread on Variable Rate		3.50%
Debt Instrument, Description of Variable Rate Basis		LIBOR plus 3.50%
CMBFL Shandong [Member]
Number of subsidiaries | item	2
Gross proceeds | $	$ 49.0
Transaction fees | $	$ 1.0
Maximum [Member] | CMBFL Shandong [Member]
Lessee, Finance Lease, Term of Contract	8 years
Minimum [Member] | CMBFL Shandong [Member]
Lessee, Finance Lease, Term of Contract	5 years

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- Definition

Period when the finance lease is scheduled to expiry.

+ References

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- Definition

The number of finance lease facility in operations.

+ References

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- Definition

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+ References

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- Definition

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- Definition

The number of vessels in operations.

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- Definition

Refers to transaction costs related to the sale leaseback.

+ References

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- Definition

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Indicates (true false) whether practical expedients are elected for not reassessing whether any expired or existing contract is or contains lease, lease classification for expired or existing lease, and initial direct cost for any existing lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Term of lessee's finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The historical cost of the asset(s) sold in connection with the sale of the property to another party and the lease of the property back to the seller.

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