Reit Conversion - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	1 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Oct. 01, 2012	Sep. 30, 2012 Potential Development Projects [Member]	Sep. 30, 2012 Potential Development Projects [Member]	Sep. 30, 2012 IT Projects [Member]	Sep. 30, 2012 IT Projects [Member]	Sep. 30, 2012 REIT Conversion [Member]	Sep. 30, 2012 REIT Conversion [Member]	Sep. 30, 2012 Maximum [Member]
Real Estate Properties [Line Items]
Number of shares approved for issuance										34
Sales price of management rights and intellectual property			$ 210,000,000
Purchase price to the Management Rights			190,000,000
Purchase price IP Rights			20,000,000
Projections of revenues and profits		4 years
Term of management rights for income amortization		65 years
REIT conversion costs	51,371,000	57,799,000						51,400,000	57,800,000
Impairment charge	21,300,000	21,287,000		14,000,000	14,000,000	7,300,000	7,300,000
Professional fees								14,000,000	20,100,000
Employment and severance costs								10,300,000	10,300,000
Underwriting costs								2,800,000	2,800,000
Various other transition costs								3,000,000	3,300,000
Estimated One Time Costs Related to REIT Conversion	73,000,000	73,000,000
Estimated Federal Income Taxes Associated With Transaction Minimum	10,000,000	10,000,000
Estimated Federal Income Taxes Associated With Transaction Maximum	$ 20,000,000	$ 20,000,000