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Investments in and Advances to Joint Ventures - Condensed Combined Statements of Operations of Unconsolidated Joint Venture Investments (Parenthetical) (Detail) (USD $) |  |  | 9 Months Ended
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Sep. 30, 2013 | Aug. 31, 2013 | Sep. 30, 2013 Coventry II Fund JV [Member]
Schedule of Equity Method Investments [Line Items] |  |  |
Investment Percentage in joint venture |  | 5.00% | 20.00%
Loss on property transfer |  |  | $ 32,600,000
Joint venture net loss attributable to company |  |  | 0
Investment basis Value For which No Income Loss Recognized | 0 |  |
Obligation or Intent to fund additional capital | $ 0 |  |

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