Significant Acquisitions and Disposals, Equity ownership percentage acquired

No definition available.

Name:	fce_Equityownershippercentageacquired
Namespace Prefix:	fce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Expected gain on change in control of interests upon closing

+ References

No definition available.

+ Details

Name:	fce_Expectedgainonchangeincontrolofinterestsuponclosing
Namespace Prefix:	fce_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Number of life science office properties

+ References

No definition available.

+ Details

Name:	fce_Numberoflifescienceofficeproperties
Namespace Prefix:	fce_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of parking facilities

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No definition available.

+ Details

Name:	fce_Numberofparkingfacilities
Namespace Prefix:	fce_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Significant Acquisitions and Disposals, ownership percentage after closing

+ References

No definition available.

+ Details

Name:	fce_Ownershippercentageafterclosing
Namespace Prefix:	fce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Significant Acquisitions and Disposals, percentage share of outstanding debt

+ References

No definition available.

+ Details

Name:	fce_Percentageshareofoutstandingdebt
Namespace Prefix:	fce_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Significant Acquisitions and Disposals, Redemption price

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No definition available.

+ Details

Name:	fce_Redemptionprice
Namespace Prefix:	fce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property.

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No definition available.

+ Details

Name:	us-gaap_NonRecourseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

Subsequent Events (Details Textual) (USD $)	0 Months Ended
Subsequent Events (Details Textual) (USD $)	Apr. 28, 2015	Mar. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Outstanding debt at closing		$ 4,202,440,000us-gaap_NonRecourseDebt	$ 4,238,201,000us-gaap_NonRecourseDebt
Subsequent Event [Member] \| MIT Assets [Member]
Subsequent Event [Line Items]
Equity ownership percentage acquired	49.00%
Number of life science office properties	7
Number of parking facilities	2
Redemption price	573,500,000
Percentage share of outstanding debt	49.00%
Outstanding debt at closing	174,000,000
Ownership percentage after closing	100.00%
Expected gain on change in control of interests upon closing	$ 400,000,000