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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
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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 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 -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=121329987&loc=SL77916155-209984 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121329987&loc=SL77916155-209984 + Details
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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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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