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Real Estate and Accumulated Depreciation (Parenthetical) (Detail) (USD $) | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
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Real Estate and Accumulated Depreciation [Line Items] |  |  |
Tax cost basis of assets | $ 8,700,000,000 | $ 8,500,000,000 | $ 8,600,000,000
Real estate land under development | 254,600,000 |  |
Real estate construction in progress | 220,500,000 |  |
The amount of tax-exempt certificates excluded from encumbrances | 15,700,000 |  |
Fair market value of debt adjustments excluded from encumbrances | $ 11,500,000 |  |

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- Definition Real estate construction in progress. + References No definition available. + Details
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- Definition Real estate land under development. + References No definition available. + Details
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- Details
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