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Variable Interest Entities (VIEs) - Additional Information (Detail) |  | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) Rigs | Jun. 30, 2018 USD ($) Rigs | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Sale Leaseback Transaction [Line Items] |  |  |  |
Number of semi submersible rigs under sale leaseback arrangements | Rigs | 2 | 2 |  |
Term of lease contracts | 15 years |  |  |
Amounts due to related parties - current | $ 4,000,000 | $ 4,000,000 |  | $ 10,000,000
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Dividend to non-controlling interests in VIEs |  | 0 | $ 14,000,000 |
Ship Finance International Ltd VIEs [Member] |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Amounts due to related parties - current |  |  |  | $ 0
SFL Deepwater Limited [Member] | Ship Finance International Ltd VIEs [Member] |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Amounts due to related parties - current | 7,000,000 | 7,000,000 |  |
SFL Hercules Limited [Member] | Ship Finance International Ltd VIEs [Member] |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Amounts due to related parties - current | 7,000,000 | 7,000,000 |  |
SFL Linus Limited [Member] | Ship Finance International Ltd VIEs [Member] |  |  |  |
Sale Leaseback Transaction [Line Items] |  |  |  |
Amounts due to related parties - current | $ 6,000,000 | $ 6,000,000 |  |

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- Definition Amount of paid and unpaid common stock dividends declared with the form of settlement in cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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