Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Schedule of Equity Method Investments [Line Items]
Unrecognized basis difference on equity method investment	$ 855,000
Venture Assets	165,564,000	134,845,000
Venture Borrowings	59,665,000	38,358,000
Venture Equity	80,824,000	69,493,000
Investment in venture	46,691,000	41,546,000
242, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	22,505,000	21,408,000
Venture Borrowings	0	810,000
Venture Equity	20,394,000	19,576,000
Investment in venture	9,342,000	8,903,000
CJUF III, RH Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	33,134,000	15,970,000
Venture Borrowings	14,800,000	1,000
Venture Equity	15,710,000	13,701,000
Investment in venture	3,529,000	3,836,000
CL Ashton Woods [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	16,536,000	15,701,000
Venture Borrowings	0	0
Venture Equity	15,071,000	15,044,000
Investment in venture	6,792,000	5,775,000
CL Realty [Member]
Schedule of Equity Method Investments [Line Items]
Unrecognized basis difference on equity method investment	2,359,000
Venture Assets	8,049,000	8,245,000
Venture Borrowings	0	0
Venture Equity	7,844,000	7,842,000
Investment in venture	3,922,000	3,921,000
FMF Peakview [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	28,772,000	16,859,000
Venture Borrowings	9,567,000	0
Venture Equity	16,736,000	13,331,000
Investment in venture	3,429,000	2,666,000
HM Stonewall Estates [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,585,000	5,184,000
Venture Borrowings	0	104,000
Venture Equity	4,585,000	5,080,000
Investment in venture	2,246,000	2,470,000
LM Land Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	26,051,000	21,094,000
Venture Borrowings	4,937,000	3,086,000
Venture Equity	19,600,000	13,128,000
Investment in venture	10,042,000	6,045,000
Temco [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	13,422,000	13,255,000
Venture Borrowings	0	0
Venture Equity	13,114,000	13,066,000
Investment in venture	6,557,000	6,533,000
Other ventures [Member]
Schedule of Equity Method Investments [Line Items]
Venture Assets	12,510,000	17,129,000
Venture Borrowings	30,361,000	34,357,000
Venture Equity	(32,230,000)	(31,275,000)
Investment in venture	$ 832,000	$ 1,397,000