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Investment in Real Estate - Net Non-Cash Impairment Charges (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate | $ 1,246 | $ (2,661) | $ 194,552
Operating Properties-Held for Sale and Sold Assets [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate | 1,410 | 4,973 | 66,026
Impairment-Discontinued Operations [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate | 1,410 | 4,973 | 66,026
Land Parcels Sold Assets [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate |  | (5,879) | 8,275
Operating Properties - Held for Use [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate | (164) | (514) | 105,826
Land Parcels - Held for Use [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate |  | (1,241) | 14,425
Impairment - Continuing Operations [Member] |  |  |
Impairment Charges [Line Items] |  |  |
Impairment of Real Estate | $ (164) | $ (7,634) | $ 128,526

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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Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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