Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Venture Assets	$ 268,757	$ 309,067
Venture Borrowings	99,862	134,103
Venture Equity	147,988	154,738
Investment in venture	79,013	82,453
242, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	26,534	26,687
Venture Borrowings	180	0
Venture Equity	24,577	24,877
Investment in venture	11,617	11,766
CL Ashton Woods
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,641	7,654
Venture Borrowings	0	0
Venture Equity	3,451	6,084
Investment in venture	1,653	3,615
CL Realty
Schedule of Equity Method Investments [Line Items]
Venture Assets	7,761	7,872
Venture Borrowings	0	0
Venture Equity	7,709	7,662
Investment in venture	3,854	3,831
CREA FMF
Schedule of Equity Method Investments [Line Items]
Venture Assets	56,348	57,820
Venture Borrowings	36,832	50,845
Venture Equity	17,940	4,291
Investment in venture	3,649	3,820
Elan 99, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	44,363	34,192
Venture Borrowings	23,352	14,587
Venture Equity	15,429	15,838
Investment in venture	13,886	14,255
FOR/SR Forsyth LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	6,950	6,500
Venture Borrowings	0	0
Venture Equity	6,950	6,500
Investment in venture	6,255	5,850
FMF Littleton
Schedule of Equity Method Investments [Line Items]
Venture Assets	59,433	52,376
Venture Borrowings	26,706	22,347
Venture Equity	24,200	24,370
Investment in venture	6,228	6,270
FMF Peakview
Schedule of Equity Method Investments [Line Items]
Venture Assets	0	48,869
Venture Borrowings	0	30,485
Venture Equity	0	16,828
Investment in venture	0	3,447
HM Stonewall Estates
Schedule of Equity Method Investments [Line Items]
Venture Assets	1,798	2,842
Venture Borrowings	0	0
Venture Equity	1,798	2,842
Investment in venture	1,034	1,294
LM Land Holdings
Schedule of Equity Method Investments [Line Items]
Venture Assets	25,479	31,984
Venture Borrowings	4,270	7,728
Venture Equity	20,619	22,751
Investment in venture	9,808	9,664
MRECV DT Holdings LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,215	4,215
Venture Borrowings	0	0
Venture Equity	4,215	4,215
Investment in venture	3,793	3,807
MRECV Edelweiss LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	2,404	2,237
Venture Borrowings	0	0
Venture Equity	2,404	2,237
Investment in venture	2,170	2,029
MREC VH Juniper Ridge LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,022	3,006
Venture Borrowings	0	0
Venture Equity	4,021	3,006
Investment in venture	3,645	2,730
MRECV Meadow Crossing II LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	2,187	728
Venture Borrowings	0	0
Venture Equity	2,187	728
Investment in venture	1,982	655
Miramonte Boulder Pass, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	13,160	12,627
Venture Borrowings	6,320	5,869
Venture Equity	5,349	5,474
Investment in venture	5,287	5,349
Temco
Schedule of Equity Method Investments [Line Items]
Venture Assets	5,295	5,284
Venture Borrowings	0	0
Venture Equity	5,181	5,113
Investment in venture	2,590	2,557
Other ventures
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,167	4,174
Venture Borrowings	2,202	2,242
Venture Equity	1,958	1,922
Investment in venture	$ 1,562	$ 1,514