Impairments of Long-lived Assets - Additional Information (Detail) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011 Y	Dec. 31, 2010
Impaired Long-Lived Assets Held and Used [Line Items]
Future land lease payment ceased					$ 4,200,000
Impairment charges	2,551,000	374,846,000	1,697,000	782,000	2,551,000	377,325,000	4,799,000
Remaining lease period of released land lease					28 years
Ceased covered airport parking lease term					7 years
Appreciation rate reduced						3.00%	5.00%
Appreciation period (in years)						8 years	11 years
Bulk sale reduced selling prices						20.00%
Discounting projected cash flows maximum						23.00%
Future capital expenditures reduced						190,000,000
Maximum Future capital expenditures period, years						10
Estimated fair value of impaired real estate		91,400,000				91,400,000
Homes and Homesites
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges						2,500,000	4,300,000
East San Marco L.L.C
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges							3,800,000
Undiscounted Cash Flow
Impaired Long-Lived Assets Held and Used [Line Items]
Carrying value of long-lived assets		$ 466,200,000				$ 466,200,000