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SEGMENT INFORMATION (Details)	12 Months Ended
	Dec. 31, 2014 major-customer	Dec. 31, 2013 major-customer	Dec. 31, 2012 major-customer
Revenue from External Customer [Line Items]
Number of reportable segments	1us-gaap_NumberOfReportableSegments
Number of operating segments	2us-gaap_NumberOfOperatingSegments
Maximum percentage consolidated operating revenues from individual major customers (in hundredths)		10.00%fro_MaximumPercentageConsolidatedOperatingRevenuesFromIndividualMajorCustomers
Major Customer 1 [Member]
Revenue from External Customer [Line Items]
Number of major customers for revenue purposes	1fro_RevenueNumberOfMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer1Member	0fro_RevenueNumberOfMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer1Member	1fro_RevenueNumberOfMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer1Member
Percent of revenue from single customer (in hundredths)			18.00%fro_EntityWideRevenueMajorCustomerPercent / us-gaap_MajorCustomersAxis = fro_MajorCustomer1Member
Maximum percentage consolidated operating revenues from individual major customers (in hundredths)	14.00%fro_MaximumPercentageConsolidatedOperatingRevenuesFromIndividualMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer1Member
Major Customer 2 [Member] [Member]
Revenue from External Customer [Line Items]
Number of major customers for revenue purposes	1fro_RevenueNumberOfMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer2MemberMember
Maximum percentage consolidated operating revenues from individual major customers (in hundredths)	10.00%fro_MaximumPercentageConsolidatedOperatingRevenuesFromIndividualMajorCustomers / us-gaap_MajorCustomersAxis = fro_MajorCustomer2MemberMember

X

- Definition

Percent of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

Name:	fro_EntityWideRevenueMajorCustomerPercent
Namespace Prefix:	fro_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the Maximum percentage of consolidated operating revenues from major customers.

+ References

No definition available.

+ Details

Name:	fro_MaximumPercentageConsolidatedOperatingRevenuesFromIndividualMajorCustomers
Namespace Prefix:	fro_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue, Number of Major Customers

+ References

No definition available.

+ Details

Name:	fro_RevenueNumberOfMajorCustomers
Namespace Prefix:	fro_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_MajorCustomersAxis=fro_MajorCustomer1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MajorCustomersAxis=fro_MajorCustomer2MemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: