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Related Party Transactions - Ship Finance Transactions - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |  |
Long-term debt due to related parties | $ 294,000,000 |  | $ 314,000,000
Short-term debt to related parties | 4,000,000 |  | 10,000,000
Interest expense | (38,000,000) | $ (195,000,000) |
Ship Finance International Ltd VIEs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Short-term debt to related parties |  |  | 0
Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Long-term debt due to related parties | 294,000,000 |  | 314,000,000
Gross loans outstanding | 318,000,000 |  | 314,000,000
Short-term debt to related parties | $ 20,000,000 |  |
Interest rate on related party debt | 4.50% |  |
Interest expense | $ 7,000,000 |  | $ 9,300,000
Minimum [Member] | Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Debt instrument maturity date | Dec. 31, 2023 |  |
Maximum [Member] | Ship Finance International Ltd VIEs [Member] | Ship Finance International Ltd VIEs [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Debt instrument maturity date | Dec. 31, 2029 |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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