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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Schedule of Equity Method Investments [Line Items] |  |  |
Company's proportionate share of the impairment charges | $ 0.6 | $ 6.7 |
Impairment charges reclassified to discontinued operations related to asset sales | 46.8 | 63.6 | 21.0
Company's share of aggregate impairment charges reclassified to discontinued operations | $ 0.5 | $ 6.3 | $ 0.7

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