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Information Regarding Indebtedness (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 2016 Notes [Member]	Dec. 31, 2011 2016 Notes [Member]	Sep. 30, 2012 2017 Notes [Member]	Dec. 31, 2011 2017 Notes [Member]	Sep. 30, 2012 2027 Notes [Member]	Dec. 31, 2011 2027 Notes [Member]	Sep. 30, 2012 2028 Notes [Member]	Dec. 31, 2011 2028 Notes [Member]	Sep. 30, 2012 2012 Notes [Member]	Dec. 31, 2011 2012 Notes [Member]	Sep. 30, 2012 2032 Notes [Member]	Dec. 31, 2011 2032 Notes [Member]	Sep. 30, 2012 2014 Notes [Member]	Dec. 31, 2011 2014 Notes [Member]	Sep. 30, 2012 2017 II Notes [Member]	Dec. 31, 2011 2017 II Notes [Member]	Sep. 30, 2012 Secured Debt [Member]	Sep. 30, 2012 Unsecured Debt [Member]
Debt Instrument [Line Items]
Mortgage and Other Loans Payable, Net	$ 781,366	$ 690,256
Unamortized Premiums	(257)	(305)
Mortgage and Other Loans Payable, Gross	781,109	689,951
Senior Unsecured Notes, Net	488,487	640,227	159,497	159,455	55,383	59,600	6,066	6,065	68,977	124,894		61,817	12,490	34,683	79,336	86,997	106,738	106,716
Unamortized Discounts	2,958	4,625
Senior Unsecured Notes, Gross	491,445	644,852
Unsecured Credit Facility	$ 27,000	$ 149,000
Interest Rate, Minimum																			4.03%
Interest Rate, Maximum																			9.25%
Interest Rate	4.03%		5.75%		7.50%		7.15%		7.60%		6.875%		7.75%		6.42%		5.95%
Interest Rate																				2.175%
Effective Interest Rate, Minimum																			4.03%
Effective Interest Rate, Maximum																			9.25%
Effective Interest Rate			5.91%		7.52%		7.11%		8.13%		6.85%		7.87%		6.54%		6.37%			2.175%
Maturity Date Range, Start																			Jan. 01, 2013
Maturity Date Range, End																			Sep. 01, 2022
Maturity Date	Sep. 01, 2022		Jan. 15, 2016		Dec. 01, 2017		May 15, 2027		Jul. 15, 2028		Apr. 15, 2012		Apr. 15, 2032		Jun. 01, 2014		May 15, 2017			Dec. 12, 2014

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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