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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	Sep. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Amounts receivable from joint ventures	$ 4.4	$ 2.7

For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group.