Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Venture Assets	$ 277,194	$ 279,674
Venture Borrowings	126,699	128,288
Venture Equity	144,637	141,802
Investment in venture	79,262	77,611
242, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	23,530	26,503
Venture Borrowings	0	1,107
Venture Equity	22,905	23,136
Investment in venture	10,904	10,934
CL Ashton Woods, LP
Schedule of Equity Method Investments [Line Items]
Venture Assets	3,064	2,653
Venture Borrowings	0	0
Venture Equity	2,948	2,198
Investment in venture	2,067	1,107
CL Realty, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	8,056	8,048
Venture Borrowings	0	0
Venture Equity	7,964	7,899
Investment in venture	3,982	3,950
CREA FMF Nashville LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	54,071	56,081
Venture Borrowings	36,018	37,446
Venture Equity	17,470	17,091
Investment in venture	4,894	4,923
Elan 99, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	49,539	49,652
Venture Borrowings	36,391	36,238
Venture Equity	12,447	13,100
Investment in venture	11,202	11,790
FOR/SR Forsyth LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	10,794	10,672
Venture Borrowings	1,569	1,568
Venture Equity	9,233	8,990
Investment in venture	8,310	8,091
FMF Littleton LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	70,434	70,282
Venture Borrowings	45,744	44,446
Venture Equity	23,634	23,798
Investment in venture	6,086	6,128
FMF Peakview LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	0	0
Venture Borrowings	0	0
Venture Equity	0	0
Investment in venture	0	0
HM Stonewall Estates, Ltd
Schedule of Equity Method Investments [Line Items]
Venture Assets	1,184	852
Venture Borrowings	0	0
Venture Equity	1,096	852
Investment in venture	579	477
LM Land Holdings, LP
Schedule of Equity Method Investments [Line Items]
Venture Assets	26,424	25,538
Venture Borrowings	3,851	3,477
Venture Equity	21,573	20,945
Investment in venture	9,900	9,685
MRECV DT Holdings LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,318	4,155
Venture Borrowings	0	0
Venture Equity	4,318	4,144
Investment in venture	3,886	3,729
MRECV Edelweiss LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	5,276	3,484
Venture Borrowings	0	0
Venture Equity	5,276	3,484
Investment in venture	5,027	3,358
MREC VH Juniper Ridge LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,169	4,156
Venture Borrowings	0	0
Venture Equity	4,169	4,156
Investment in venture	3,428	3,741
MRECV Meadow Crossing II LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	2,615	2,492
Venture Borrowings	0	0
Venture Equity	2,614	2,491
Investment in venture	2,352	2,242
Miramonte Boulder Pass, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	9,333	10,738
Venture Borrowings	3,126	4,006
Venture Equity	4,710	5,265
Investment in venture	4,505	5,330
Temco Associates, LLC
Schedule of Equity Method Investments [Line Items]
Venture Assets	4,387	4,368
Venture Borrowings	0	0
Venture Equity	4,280	4,253
Investment in venture	2,140	2,126
Other ventures
Schedule of Equity Method Investments [Line Items]
Venture Assets	0	0
Venture Borrowings	0	0
Venture Equity	0	0
Investment in venture	$ 0	$ 0