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TRADE ACCOUNTS RECEIVABLE, NET (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |
Beginning balance | $ (9,912)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (9,857)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (4,487)us-gaap_AllowanceForDoubtfulAccountsReceivable
Additions charged to income | (68)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (55)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease | (6,033)us-gaap_AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease
Deductions credited to income |  |  | 663 fro_ReleaseOfAllowanceForDoubtfulAccounts
Ending balance | $ (9,980)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (9,912)us-gaap_AllowanceForDoubtfulAccountsReceivable | $ (9,857)us-gaap_AllowanceForDoubtfulAccountsReceivable

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- Definition Release of allowance for doubtful accounts + References No definition available. + Details
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Namespace Prefix: | fro_
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Balance Type: | credit
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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Definition Amount of increase (decrease) in the allowance for doubtful accounts. + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration