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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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Number of semi submersible rigs under sale lease back arrangements.

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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

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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