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Receivables - Additional Information (Detail) (USD $) | 3 Months Ended
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Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Due period of notes receivable as secured by deed of trust | 3 years
Loans Receivable [Member] |
Accounts, Notes, Loans and Financing Receivable [Line Items] |
Principal amount of loan received | 4,394,000 for_LoanSecuredByRealEstatePrincipalAmountReceived / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember
Interest amount of loan received | 49,000 us-gaap_ProceedsFromInterestReceived / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_LoansReceivableMember

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- Definition Due period of notes receivable as secured by a deed of trust. + References No definition available. + Details
Name: | for_DuePeriodOfNotesReceivableAsSecuredByDeedOfTrust
Namespace Prefix: | for_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Loan Secured By Real Estate Principal Amount Received + References No definition available. + Details
Name: | for_LoanSecuredByRealEstatePrincipalAmountReceived
Namespace Prefix: | for_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Interest received on loans and other debt instruments during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
Name: | us-gaap_ProceedsFromInterestReceived
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_LoansReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |