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Investments in Joint Ventures Investments in Joint Ventures - Condensed Combined Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gross Investment in Real Estate | $ 3,119,547 |  | $ 3,130,942 |  | $ 3,115,050 | $ 3,140,649
Less: Accumulated Depreciation | (748,044) |  | (732,635) |  |  |
Net Investment in Real Estate | 2,371,503 |  | 2,388,813 |  |  |
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $40,387 and $0 | 0 |  | 6,765 |  |  |
Total Assets | 2,597,510 |  | 2,608,842 |  |  |
Indebtedness | 1,297,671 |  |  |  |  |
Total Liabilities and Equity | 2,597,510 |  | 2,608,842 |  |  |
Carrying Value of the Company's Investments in Joint Ventures | 907 |  | 1,012 |  |  |
Corporate Joint Venture [Member] |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Gross Investment in Real Estate | 28,389 |  | 115,488 |  |  |
Less: Accumulated Depreciation | (4,253) |  | (38,535) |  |  |
Net Investment in Real Estate | 24,136 |  | 76,953 |  |  |
Real Estate and Other Assets Held for Sale, Net of Accumulated Depreciation and Amortization of $40,387 and $0 | 48,408 |  | 0 |  |  |
Other Assets | 7,690 |  | 17,327 |  |  |
Total Assets | 80,234 |  | 94,280 |  |  |
Indebtedness | 24,656 |  | 81,764 |  |  |
Other Liabilities | 1,615 |  | 4,817 |  |  |
Indebtedness, Accrued Interest Expense and Leasing Intangibles Held for Sale, Net of Accumulated Amortization of $3,208 and $0 | 48,651 |  | 0 |  |  |
Equity | 5,312 |  | 7,699 |  |  |
Total Liabilities and Equity | 80,234 |  | 94,280 |  |  |
Company's Share of Equity | 896 |  | 1,252 |  |  |
Basis Differentials | (200) | [1] | (448) | [1] |  |
Carrying Value of the Company's Investments in Joint Ventures | $ 696 |  | $ 804 |  |  |
[1] | This amount represents the aggregate difference between our historical cost basis and the basis reflected at the joint venture level. Basis differentials are primarily comprised of impairments we recorded to reduce certain of our investments in the 2003 Net Lease Joint Venture to fair value and certain deferred fees which are not reflected at the joint venture level.

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- Definition This element represents a liability, related to a disposal group that is held for sale and anticipated to be sold in less than one year, associated with the acquisition of an off-market lease when the terms of the lease are unfavorable to the market terms for the lease at the date of acquisition. The liability is expected to be discharged as part of the plan of sale for the asset. + References No definition available. + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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