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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
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