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INCOME TAXES (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Percentage of transportation revenue from sources within the United States | 50.00% |  |
Revenue tax rate percentage | 4.00% |  |
Revenue tax expense | $ 0 | $ 0 | $ 0

X
- Definition percentage of transportation revenue from sources within the United States + References No definition available. + Details
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Namespace Prefix: | fro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue tax expense + References No definition available. + Details
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Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition revenue tax rate percentage + References No definition available. + Details
Name: | fro_Revenuetaxratepercentage
Namespace Prefix: | fro_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration