Investments in Joint Ventures - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Investment [Line Items]
Deficit Distributions	$ 846,000		$ 846,000		$ 928,000
Impairment on investments	0	0	0	0
Notes payable	751,700,000		751,700,000		752,056,000
Guarantees not provided
Investment [Line Items]
Notes payable	6,400,000		6,400,000		48,300,000
Notes payable secured by real property	21,700,000		21,700,000		44,200,000
Unconsolidated Joint Ventures | Guarantee provided
Investment [Line Items]
Notes payable outstanding	4,000,000		4,000,000		11,200,000
Indemnification agreement from joint ventures, percentage	90.00%		90.00%		90.00%
Unconsolidated Joint Ventures | Total Notes Payable
Investment [Line Items]
Notes payable	32,100,000		32,100,000		103,700,000
Unconsolidated Joint Ventures | Total Notes Payable | Bank and Seller Financing Notes Payable
Investment [Line Items]
Notes payable secured by real property	25,700,000		25,700,000		55,400,000
Unconsolidated Joint Ventures | Maximum
Investment [Line Items]
Ownership interest	50.00%		50.00%
Unconsolidated Joint Ventures | SCLLC | Bank and Seller Financing Notes Payable
Investment [Line Items]
Notes payable secured by real property					14,000,000
Joint Ventures
Investment [Line Items]
Deficit Distributions	800,000		800,000		900,000
Notes payable					48,300,000
Notes payable secured by real property	6,400,000		6,400,000		15,400,000
Joint Ventures | Indirect
Investment [Line Items]
Ownership interest	12.30%		12.30%		12.30%
Notes payable secured by real property	7,200,000		7,200,000		7,200,000
Joint Ventures | SCLLC
Investment [Line Items]
Notes payable					40,900,000
Notes payable secured by real property					$ 15,400,000