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Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges on Consolidated Assets (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Investment Securities [Line Items] |  |  |  |
Company's proportionate share of impairment related to land under development for consolidated joint ventures |  |  | $ 50,400,000 | $ 41,900,000
Impairment charge related to abandoned development project | 19,300,000 |  |  | 19,300,000
Company's share of impairment of assets formerly occupied by major tenant |  |  |  | 16,500,000
Impairment of unconsolidated joint venture investments |  | 26,671,000 | 2,921,000 | 227,000
12 Months Ended Coventry II DDR Montgomery Farm LLC [Member] |  |  |  |
Investment Securities [Line Items] |  |  |  |
Impairment of unconsolidated joint venture investments |  | $ 26,100,000 |  |

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- Definition Company's share of impairment of assets formerly occupied by major tenant. + References No definition available. + Details
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- Definition This element represents the impairment charge for land under development recognized to earnings after the allocation of the non-controlling interest. + References No definition available. + Details
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- Definition Impairment charge related to abandoned development project. + References No definition available. + Details
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- Details
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- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e25351-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 16B -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. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-2/124-2 -Paragraph 22 -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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