Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Venture Assets	$ 286,052	$ 309,067
Venture Borrowings	119,823	134,103
Venture Equity	148,831	154,738
Investment in venture	79,730	82,453
242, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	28,221	26,687
Venture Borrowings	1,649	0
Venture Equity	24,413	24,877
Investment in venture	11,535	11,766
CL Ashton Woods
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,445	7,654
Venture Borrowings	0	0
Venture Equity	3,602	6,084
Investment in venture	1,978	3,615
CL Realty
Schedule of Equity Method Investments [Line Items]
Venture Assets	7,829	7,872
Venture Borrowings	0	0
Venture Equity	7,726	7,662
Investment in venture	3,863	3,831
CREA FMF
Schedule of Equity Method Investments [Line Items]
Venture Assets	56,165	57,820
Venture Borrowings	36,945	50,845
Venture Equity	17,441	4,291
Investment in venture	3,500	3,820
Elan 99, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	48,248	34,192
Venture Borrowings	29,788	14,587
Venture Equity	14,494	15,838
Investment in venture	13,045	14,255
FOR/SR Forsyth LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	8,249	6,500
Venture Borrowings	0	0
Venture Equity	8,233	6,500
Investment in venture	7,410	5,850
FMF Littleton
Schedule of Equity Method Investments [Line Items]
Venture Assets	68,528	52,376
Venture Borrowings	37,328	22,347
Venture Equity	24,022	24,370
Investment in venture	6,184	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	1,660	2,842
Venture Borrowings	0	0
Venture Equity	1,660	2,842
Investment in venture	693	1,294
LM Land Holdings
Schedule of Equity Method Investments [Line Items]
Venture Assets	27,009	31,984
Venture Borrowings	4,983	7,728
Venture Equity	21,388	22,751
Investment in venture	9,934	9,664
MRECV DT Holdings LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,287	4,215
Venture Borrowings	0	0
Venture Equity	4,287	4,215
Investment in venture	3,629	3,807
MRECV Edelweiss LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	2,472	2,237
Venture Borrowings	0	0
Venture Equity	2,466	2,237
Investment in venture	2,471	2,029
MREC VH Juniper Ridge LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,179	3,006
Venture Borrowings	0	0
Venture Equity	4,179	3,006
Investment in venture	3,827	2,730
MRECV Meadow Crossing II LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	2,224	728
Venture Borrowings	0	0
Venture Equity	2,224	728
Investment in venture	2,028	655
Miramonte Boulder Pass, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	13,063	12,627
Venture Borrowings	6,973	5,869
Venture Equity	5,506	5,474
Investment in venture	5,450	5,349
Temco
Schedule of Equity Method Investments [Line Items]
Venture Assets	5,312	5,284
Venture Borrowings	0	0
Venture Equity	5,192	5,113
Investment in venture	2,596	2,557
Other ventures
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,161	4,174
Venture Borrowings	2,157	2,242
Venture Equity	1,998	1,922
Investment in venture	$ 1,587	$ 1,514