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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Statement Of Financial Position [Abstract] |  |
Amounts receivable from joint ventures | $ 36.3 | $ 34.3

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