Organization and Significant Accounting Policies - Supplemental Cash Flow Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Supplemental Cash Flow Information [Line Items]
Interest paid, including interest capitalized	$ 51,417	$ 60,447	$ 60,589
Income tax payments, net	3	386	(1,100)
Non-cash investing and financing activities:
Dividends and distributions payable	13,653	11,692	9,814
Conversions of redeemable common units	591	547	74
Common stock 401k matching contribution	639	655	700
Construction cost accruals, increase (decrease)	7,422	1,475	(5,324)
Adjustments to equity related to redeemable common units, net	(850)	(1,270)	(3,041)
For-sale condominium and other assets			27,343
Cash			28
Indebtedness			44,553
Accounts payable and accrued expenses			$ 3,029