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Share Based Compensation - Components of Share-Based Compensation Expense (Income) (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Total share-based compensation | $ 3,342 us-gaap_ShareBasedCompensation | $ 313 us-gaap_ShareBasedCompensation
Compensation Expense | 116 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense | 0 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Share based and Long Term Incentive Compensation | 3,458 for_ShareBasedandLongTermIncentiveCompensation | 313 for_ShareBasedandLongTermIncentiveCompensation
Cash Settled Awards [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Total share-based compensation | 296 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = for_CashSettledAwardsMember | (2,683)us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = for_CashSettledAwardsMember
Equity-settled awards [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Total share-based compensation | 1,997 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = for_EquitySettledAwardsMember | 2,349 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = for_EquitySettledAwardsMember
Restricted Stock [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Total share-based compensation | 17 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 46 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Employee Stock Option [Member] |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |
Total share-based compensation | $ 1,032 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 601 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember

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- Definition Share Based and Long Term Incentive Compensation + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Details
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Period Type: |

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- Details
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Period Type: |

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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |