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Summarized Operating Results and Financial Position of Unconsolidated Entities (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 The Land Mark at One Market
Investments in and Advances to Affiliates [Line Items]
Gain on acquisition of Landmark at One Market	$ 46,371	$ 4,297	$ 4,297

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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