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Subsequent Events - Additional Information (Detail) | Apr. 01, 2020 EUR (€) | Jan. 25, 2016 EUR (€) | May 26, 2014 EUR (€) | Feb. 13, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | ---
Subsequent Event [Line Items] |  |  |  |  |
Contractual obligation | $ |  |  |  |  | $ 26,021,543
Equity Method Investment Ownership Percentage |  |  |  |  | 50.10%
Vessel Construction Fee Per Vessel [Member] | Brave [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Related party transaction, expenses from transactions with related party | € |  | € 490,000 | € 390,000 |  |
Subsequent Event [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Contractual obligation | $ |  |  |  | $ 80,550,000 |
Equity Method Investment Ownership Percentage |  |  |  | 51.00% |
Subsequent Event [Member] | Vessel Construction Fee Per Vessel [Member] | Brave [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Related party transaction, expenses from transactions with related party | € | € 390,000 |  |  |  |

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- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
Name: | us-gaap_ContractualObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |