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Consolidated Statements of Changes in Equity (USD $) | Total | Share Capital [Member] | Additional Paid In Capital [Member] | Contributed Surplus [Member] | Accumulated Other Comprehensive Loss [Member] | Retained (Deficit) Earnings [Member] | Parent [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2011 |  | $ 194,646,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 225,769,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 248,360,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | $ (4,779,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (463,012,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | $ 12,495,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the beginning of year (in shares) at Dec. 31, 2011 |  | 77,858,502 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares issued |  | 0 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Capital reorganization |  | (116,788,000)fro_CapitalReorganization / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (116,788,000)fro_CapitalReorganization / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Shares issued |  | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Debt-for-Equity exchange |  |  | 0 fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Stock option expense |  |  | 821,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary |  |  | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Transfer to contributed surplus |  |  | (225,769,000)fro_AdjustmentToAdditionalPaidUpCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Transfer from additional paid in capital |  |  |  | 225,769,000 fro_AdjustmentToContributedSurplus / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |  |
Other comprehensive (loss) income | 624,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 624,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Net loss | (83,775,000)us-gaap_ProfitLoss |  |  |  |  | (82,754,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (1,021,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year at Dec. 31, 2012 | 131,149,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 194,646,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 821,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 474,129,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | (4,155,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (545,766,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 119,675,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 11,474,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2012 |  | 77,858,502 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares issued |  | 8,653,211 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Capital reorganization |  | 0 fro_CapitalReorganization / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 fro_CapitalReorganization / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Shares issued |  | 8,654,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 3,285,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Debt-for-Equity exchange |  |  | 28,930,000 fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Stock option expense |  |  | 161,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary |  |  | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 0 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Transfer to contributed surplus |  |  | 0 fro_AdjustmentToAdditionalPaidUpCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Transfer from additional paid in capital |  |  |  | 0 fro_AdjustmentToContributedSurplus / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |  |
Other comprehensive (loss) income | 852,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 852,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Net loss | (191,082,000)us-gaap_ProfitLoss |  |  |  |  | (188,509,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (2,573,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year at Dec. 31, 2013 | (18,051,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 86,512,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 149,985,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 474,129,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | (3,303,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (734,275,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (26,952,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 8,901,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2013 | 86,511,713 us-gaap_CommonStockSharesOutstanding | 86,511,713 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Increase (decrease) in Equity [Roll Forward] |  |  |  |  |  |  |  |
Shares issued |  | 25,831,276 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Shares issued |  | 25,831,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 40,091,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Debt-for-Equity exchange |  |  | 54,008,000 fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Stock option expense |  |  | 37,000 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Gain (Loss) on Disposition of Stock in Subsidiary |  |  | (103,000)us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  | 153,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Transfer to contributed surplus |  |  | 0 fro_AdjustmentToAdditionalPaidUpCapital / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |  |  |
Transfer from additional paid in capital |  |  |  | 0 fro_AdjustmentToContributedSurplus / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember |  |  |  |
Other comprehensive (loss) income | (955,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (955,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |  |  |
Net loss | (171,660,000)us-gaap_ProfitLoss |  |  |  |  | (162,938,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  | (8,722,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year at Dec. 31, 2014 | $ (70,649,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | $ 112,343,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 244,018,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 474,129,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_OtherAdditionalCapitalMember | $ (4,258,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (897,213,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (70,981,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 332,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2014 | 112,342,989 us-gaap_CommonStockSharesOutstanding | 112,342,989 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |

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