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Fair Value - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Mar. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Impairment of Residential Properties | $ 225 | $ 504 | $ 729 |
Impairment of Proved Oil and Gas Properties |  |  | 25,035 |
Asset Impairment Charges |  |  | $ 25,764 | $ 0

X
- Definition Impairment of Proved Oil and Gas Properties + References No definition available. + Details
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Namespace Prefix: | for_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Impairment of Residential Properties + References No definition available. + Details
Name: | for_ImpairmentofResidentialProperties
Namespace Prefix: | for_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration