Real Estate Activities - Revenues Costs and Expenses Associated with Consolidated Condominium Activities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Real Estate Properties [Line Items]
Condominium revenues	$ 89,698	$ 57,944	$ 68,500
Condominium costs and expenses	(54,037)	(48,407)	(62,339)
Net gains on sales of residential condominiums, before income tax	35,661	9,537	6,161
Net gain on sale of retail condominium, before income tax		977
Income tax benefit	612
Net gains on sales of condominiums	$ 36,273	$ 10,514	$ 6,161