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Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Schedule of Equity Method Investments [Line Items] |  |  |
Company's proportionate share of the impairment charges | $ 10.6 | $ 0.4 | $ 5.7
Company's share of aggregate impairment charges reclassified to discontinued operations |  | 0.7 | 7.2
Investment basis Value For which No Income Loss Recognized | 0 |  |
Obligation or Intent to fund additional capital | 0 |  |
Unconsolidated Joint Ventures [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Impairment charges reclassified to discontinued operations related to asset sales | 6.8 | 56.3 | 127.0
Coventry II Fund JV [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Percentage in joint venture | 20.00% |  |
Loss on property transfer | 32.6 |  |
Joint venture net loss attributable to company | $ 0 |  |

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- Definition Company's Proportionate Share of Impairment Charges + References No definition available. + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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