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Receivables - Receivables (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 16,043for_AccountsAndNotesReceivableGross		$ 24,847for_AccountsAndNotesReceivableGross
Oil and Gas Joint Interest Billing Receivables	2,657us-gaap_OilAndGasJointInterestBillingReceivables		5,738us-gaap_OilAndGasJointInterestBillingReceivables
Allowance for bad debts	(258)us-gaap_AllowanceForDoubtfulAccountsReceivable		(258)us-gaap_AllowanceForDoubtfulAccountsReceivable
Receivables, net	15,785us-gaap_AccountsAndNotesReceivableNet		24,589us-gaap_AccountsAndNotesReceivableNet
Oil and gas revenue accrual receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	6,811for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = for_OilandgasrevenueaccrualreceivableMember		7,293for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = for_OilandgasrevenueaccrualreceivableMember
Receivables and accrued interest [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,696for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = for_OtherReceivablesAndAccruedInterestMember		6,505for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = for_OtherReceivablesAndAccruedInterestMember
Notes receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,879for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_NotesReceivableMember		1,737for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_NotesReceivableMember
Average interest rate	9.90%for_AverageInterestRates / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_NotesReceivableMember	4.41%for_AverageInterestRates / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_NotesReceivableMember
Loan secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 0for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember		$ 3,574for_AccountsAndNotesReceivableGross / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember

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+ References

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Average interest rates.

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Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of account and note receivables due from other than related parties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3-4)

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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 FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524



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-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

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Portion of accounts receivable attributable to joint interest partners in oil and gas properties. These are billings to the non-operators associated with the operation of wells and are based on those owners' working interests in the wells.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 932

-SubTopic 323

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6474814&loc=d3e64006-109457

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