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FINANCIAL INSTRUMENTS - Fair Values (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total U.S. dollar denominated floating rate debt | $ 1,553,905 | $ 1,524,995
Total U.S. dollar denominated fixed rate debt | 120,000 | 186,000
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 174,223 | 66,484
Restricted cash | 3,153 | 1,420
Total U.S. dollar denominated floating rate debt | 1,553,928 | 1,525,028
Total U.S. dollar denominated fixed rate debt | 146,225 | 212,696
Level 1 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 174,223 | 66,484
Restricted cash | 3,153 | 1,420
Total U.S. dollar denominated floating rate debt | 0 | 0
Total U.S. dollar denominated fixed rate debt | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Total U.S. dollar denominated floating rate debt | 1,553,928 | 1,525,028
Total U.S. dollar denominated fixed rate debt | 7,329 | 7,631
Level 3 | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 0 | 0
Restricted cash | 0 | 0
Total U.S. dollar denominated floating rate debt | 0 | 0
Total U.S. dollar denominated fixed rate debt | 138,896 | 205,065
Carrying (Reported) Amount, Fair Value Disclosure |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 174,223 | 66,484
Restricted cash | 3,153 | 1,420
Total U.S. dollar denominated floating rate debt | 1,553,928 | 1,525,028
Total U.S. dollar denominated fixed rate debt | 147,413 | 215,524
Estimate of Fair Value, Fair Value Disclosure |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash and cash equivalents | 174,223 | 66,484
Restricted cash | 3,153 | 1,420
Total U.S. dollar denominated floating rate debt | 1,553,928 | 1,525,028
Total U.S. dollar denominated fixed rate debt | $ 146,225 | $ 212,696

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This item includes restricted cash and investments which are restricted as to withdrawal or usage. + References No definition available. + Details
Name: | fro_RestrictedCashAndInvestmentsFairValueDisclosure
Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Total US Dollar fixed rate debt + References No definition available. + Details
Name: | fro_TotalUSDollarfixedratedebt
Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total US Dollar floating rate debt + References No definition available. + Details
Name: | fro_TotalUSDollarfloatingratedebt
Namespace Prefix: | fro_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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