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Schedule III - Real Estate and Accumulated Depreciation (Parenthetical) (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land | $ 691,726,000 | $ 638,071,000 |
Buildings and Improvements | 2,403,654,000 | 2,326,245,000 |
Less: Accumulated Depreciation | 732,635,000 | 658,729,000 |
Subtotal | 2,362,745,000 |  |
Construction in Progress | 26,068,000 | 27,780,000 |
Net Investment in Real Estate | 2,388,813,000 | 2,333,367,000 |
Total at December 31, 2012 | 6,765,000 | 91,659,000 |
Tenant Improvements | Life of lease |  |
Aggregate cost of land and buildings and equipment for federal income tax purpose | 3,100,000,000 |  |
Balance, Beginning of Year | 3,115,050,000 | 3,140,649,000 | 3,351,626,000
Acquisition of Real Estate Assets | 65,770,000 | 22,953,000 | 17,595,000
Construction Costs and Improvements | 74,116,000 | 72,822,000 | 49,881,000
Disposition of Real Estate Assets | (94,093,000) | (91,312,000) | (50,929,000)
Impairment of Real Estate | (1,246,000) | 2,661,000 | (194,552,000)
Write-off of Fully Depreciated Assets | (28,655,000) | (32,723,000) | (32,972,000)
Balance, End of Year | 3,130,942,000 | 3,115,050,000 | 3,140,649,000
Balance, Beginning of Year | 695,931,000 | 663,310,000 | 597,461,000
Depreciation for Year | 100,074,000 | 95,931,000 | 104,175,000
Disposition of Assets | (31,757,000) | (30,587,000) | (5,354,000)
Balance, End of Year | 735,593,000 | 695,931,000 | 663,310,000
Gross Amount Carried At Close of Period [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land | 694,116,000 |  |
Buildings and Improvements | 2,410,758,000 |  |
Less: Accumulated Depreciation | (735,593,000) |  |
Subtotal | 2,369,281,000 |  |
Construction in Progress | 26,068,000 |  |
Net Investment in Real Estate | 2,395,349,000 |  |
Assets Held-for-sale [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Land | 2,390,000 |  |
Buildings and Improvements | 7,104,000 |  |
Less: Accumulated Depreciation | 2,958,000 |  |
Subtotal | 6,536,000 |  |
Net Investment in Real Estate | 6,536,000 |  |
Deferred Rent Receivable, Net and Other Assets, Net | $ 229,000 |  |
Buildings and Improvements [Member] | Minimum [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Property, plant and equipment, useful life | 7 years |  |
Buildings and Improvements [Member] | Maximum [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Property, plant and equipment, useful life | 50 years |  |
Land Improvements [Member] | Minimum [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Land Improvements [Member] | Maximum [Member] |  |  |
Real Estate and Accumulated Depreciation [Line Items] |  |  |
Property, plant and equipment, useful life | 20 years |  |

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- Definition The current amount of expenditures for a real estate project that has not yet been completed. + 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 210.7-03.10) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + 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 Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -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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