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Investment in Real Estate - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 sqft Parcels Property | Mar. 31, 2012 Property | Dec. 31, 2012 Property
Real Estate Investments [Line Items] |  |  |
Number of Land Parcels Acquired | 2 |  |
Purchase price of land parcels | $ 9,334 |  |
Number of industrial properties sold | 4 | 3 | 28
Gross leasable area (GLA) of industrial properties sold | 200,000 |  |
Number of Land Parcels Sold | 2 |  |
Proceeds from the sales | 11,187 |  |
Net loss on sale of properties | 2,812 | (6,199) |
Number Of Sold Land Parcels Included In Continuing Operations | 2 |  |
Number of industrial properties held for sale | 4 |  |
Gross leasable area (GLA) of industrial properties held for sale | 800,000 |  |
Number Of Land Parcels Held For Sale | 1 |  |
Impairment reversal of industrial properties |  | 304 |
Notes receivable outstanding | 41,065 |  | 41,201
Net discount of notes receivable outstanding | 239 |  | 255
Fair value of notes receivable | $ 43,267 |  | $ 44,783
Discontinuing Operations [Member] |  |  |
Real Estate Investments [Line Items] |  |  |
Number of Sold Properties Included in Discontinued Operations | 4 |  |

X
- Definition Gross proceeds from the sale of industrial properties. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Impairment reversal of industrial properties and land parcels. + References No definition available. + Details
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- Definition The number of industrial properties held for sale. + References No definition available. + Details
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- Definition Number of industrial properties held for sale. + References No definition available. + Details
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- Definition Number of land parcels acquired. + References No definition available. + Details
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Namespace Prefix: | fr_
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- Definition Number of land parcels held for sale. + References No definition available. + Details
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- Definition Number Of Land Parcels Sold + References No definition available. + Details
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Namespace Prefix: | fr_
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Balance Type: | na
Period Type: | duration

X
- Definition The number of sold land parcels and related gain loss on sale of real estate included in continuing operations. + References No definition available. + Details
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Namespace Prefix: | fr_
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Balance Type: | na
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X
- Definition The number of sold properties and the related gain or loss on sale of real estate included in discontinued operations. + References No definition available. + Details
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- Details
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X
- Definition Square Footage Of Industrial Properties Held For Sale. + References No definition available. + Details
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- Definition Square footage of industrial properties sold. + References No definition available. + Details
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Namespace Prefix: | fr_
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Balance Type: | na
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X
- Definition Amount of acquisition cost of a business combination allocated to land included in real estate. + References No definition available. + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income 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 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money at a future date(s). + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph b -Article 5 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Article 5 + Details
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- Definition Disclosure of the unamortized amount of the discount on the note or receivable which is deducted from the face amount of the receivable or loan. The discount or premium is the difference between the present value and the face amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 21 -Paragraph 16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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