Net rentable area acquired in an asset purchase or business combination

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Number of real estate properties acquired

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- Definition

Prepaid Expense, Related Party

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Related Party Transaction, Due Date

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Related Party Transaction Interest Rate Range, Max

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Related Party Transaction Interest Rate Range, Min

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- Definition

For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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- Definition

Area of land held.

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- Definition

For an unclassified balance sheet, amounts due from related parties including affiliates, employees, joint ventures, officers and stockholders, immediate families thereof, and pension funds.

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Carrying amount as of the balance sheet date of obligations due all related parties.

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Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations.

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The amount for notes payable (written promise to pay), due to related parties.

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For an unclassified balance sheet, amounts due from parties associated with the reporting entity as evidenced by a written promise to pay.

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- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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No definition available.

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- Definition

Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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Investments in Unconsolidated Joint Ventures - Related Party (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Equity Method Investee [Member] \| Comcast Innovation and Technology Center [Member]
Related Party Transaction [Line Items]
Revenue from Related Parties	$ 1,800,000
Philadelphia [Member] \| Equity Method Investee [Member] \| Liberty Commerz 1701 JFK Boulevard, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	2,400,000	2,200,000	2,200,000
Philadelphia [Member] \| Equity Method Investee [Member] \| Liberty Commerz 1701 JFK Boulevard, LP [Member] \| Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	409,000	323,000
Philadelphia [Member] \| Equity Method Investee [Member] \| Liberty Commerz 1701 JFK Boulevard, LP [Member] \| Accounts Receivable [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties		135,000
Philadelphia [Member] \| Equity Method Investee [Member] \| Liberty Commerz 1701 JFK Boulevard, LP [Member] \| Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Due from Related Parties	59,000	59,000
Philadelphia [Member] \| Equity Method Investee [Member] \| Comcast Innovation and Technology Center [Member] \| Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Due to Related Parties	554,000
United Kingdom [Member] \| Equity Method Investee [Member] \| Kings Hill Unit Trust [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	285,000	237,000	333,000
Related Party Transaction Rate Range, Min	2.00%
Related Party Transaction Rate Range, Max	10.00%
Related Party Transaction, Due Date	2/1/2016
Prepaid Expense, Related Party		47,000
United Kingdom [Member] \| Equity Method Investee [Member] \| Kings Hill Unit Trust [Member] \| Accounts Receivable [Member]
Related Party Transaction [Line Items]
Accounts Receivable, Related Parties	267,000	133,000
United Kingdom [Member] \| Equity Method Investee [Member] \| Kings Hill Unit Trust [Member] \| Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Notes Receivable, Related Parties	18,100,000	18,600,000
United Kingdom [Member] \| Equity Method Investee [Member] \| Blythe Valley JV Sarl [Member]
Related Party Transaction [Line Items]
Management Fees Revenue		33,000	355,000
United Kingdom [Member] \| Equity Method Investee [Member] \| Cambridge Medipark Ltd [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Due Date	0
Related Party Transaction, Rate	0.00%
United Kingdom [Member] \| Equity Method Investee [Member] \| Cambridge Medipark Ltd [Member] \| Investments in and advances to unconsolidated joint ventures [Member]
Related Party Transaction [Line Items]
Notes Payable, Related Parties	2,900,000	3,000,000
Chicago Milwaukee [Member] \| Equity Method Investee [Member] \| Liberty Illinois, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	1,000,000	952,000	655,000
New Jersey [Member] \| Other Segments [Member] \| Equity Method Investee [Member] \| Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	1,400,000	578,000	619,000
New Jersey [Member] \| Land, Buildings and Improvements [Member] \| Other Segments [Member] \| General Partner [Member] \| Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Number of real estate properties acquired	3
Related Party Transaction, Purchases from Related Party	43,000,000
New Jersey [Member] \| Building and Building Improvements [Member] \| Other Segments [Member] \| General Partner [Member] \| Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Net rentable area acquired	603,000
New Jersey [Member] \| Land [Member] \| Other Segments [Member] \| General Partner [Member] \| Liberty Venture I, LP [Member]
Related Party Transaction [Line Items]
Area of Land	51
Northern Virginia and Washington DC [Member] \| Other Segments [Member] \| Equity Method Investee [Member] \| Liberty Washington, LP [Member]
Related Party Transaction [Line Items]
Management Fees Revenue	4,400,000	4,900,000	4,500,000
Northern Virginia and Washington DC [Member] \| Other Segments [Member] \| Equity Method Investee [Member] \| Liberty Washington, LP [Member] \| Prepaid Expenses and Other Current Assets [Member]
Related Party Transaction [Line Items]
Due from Related Parties	470,000	523,000
Northern Virginia and Washington DC [Member] \| Other Segments [Member] \| Equity Method Investee [Member] \| Liberty Washington, LP [Member] \| Accounts Receivable [Member]
Related Party Transaction [Line Items]
Due from Related Parties		$ 98,000