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Investment in Unconsolidated Ventures - Additional Information (Details) | Jun. 30, 2020 venture
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Schedule of Equity Method Investments [Line Items] |
Number of ventures under ownership interest using equity method | 4

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- Definition Number of Equity Method Investments + References No definition available. + Details
Name: | for_NumberofEquityMethodInvestments
Namespace Prefix: | for_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration