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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   $ 194,646,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 225,769,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 248,360,000us-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		   $ 12,495,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at the beginning of year (in shares) at Dec. 31, 2011   77,858,502us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Increase (decrease) in Equity [Roll Forward]                
Shares issued   0us-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   0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Debt-for-Equity exchange     0fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Stock option expense     821,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Gain (Loss) on Disposition of Stock in Subsidiary     0us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		         0us-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       225,769,000fro_AdjustmentToContributedSurplus
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_OtherAdditionalCapitalMember		        
Other comprehensive (loss) income 624,000us-gaap_OtherComprehensiveIncomeLossNetOfTax       624,000us-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 131,149,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 194,646,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 821,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 474,129,000us-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		 119,675,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		 11,474,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2012   77,858,502us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Increase (decrease) in Equity [Roll Forward]                
Shares issued   8,653,211us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Capital reorganization   0fro_CapitalReorganization
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 0fro_CapitalReorganization
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Shares issued   8,654,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 3,285,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Debt-for-Equity exchange     28,930,000fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Stock option expense     161,000us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Gain (Loss) on Disposition of Stock in Subsidiary     0us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		         0us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Transfer to contributed surplus     0fro_AdjustmentToAdditionalPaidUpCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Transfer from additional paid in capital       0fro_AdjustmentToContributedSurplus
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_OtherAdditionalCapitalMember		        
Other comprehensive (loss) income 852,000us-gaap_OtherComprehensiveIncomeLossNetOfTax       852,000us-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 86,512,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 149,985,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 474,129,000us-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		 8,901,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2013 86,511,713us-gaap_CommonStockSharesOutstanding 86,511,713us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Increase (decrease) in Equity [Roll Forward]                
Shares issued   25,831,276us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Shares issued   25,831,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 40,091,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Debt-for-Equity exchange     54,008,000fro_AdjustmentstoAdditionalPaidinCapitalDebtConversion
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Stock option expense     37,000us-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		         153,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Transfer to contributed surplus     0fro_AdjustmentToAdditionalPaidUpCapital
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		          
Transfer from additional paid in capital       0fro_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 $ 112,343,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 244,018,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 474,129,000us-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		 $ 332,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
Balance at the end of year (in shares) at Dec. 31, 2014 112,342,989us-gaap_CommonStockSharesOutstanding 112,342,989us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember