Investment in Unconsolidated Entities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 7,300
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	46,443	$ 30,294
Revenues	976,021	791,660	$ 623,647
Net income	117,797	64,302	64,535
Cash	19,479	33,269	38,315	$ 36,684
Assets	988,847	875,539
Liabilities	325,895	325,533
Stockholders' Equity Attributable to Parent	640,242	523,168	468,351	416,347
Stockholders' Equity Attributable to Noncontrolling Interest	9,167	13,227	17,281	16,691
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	649,409	536,395	485,632	$ 433,038
Liabilities and Equity	988,847	875,539
Income (Loss) from Equity Method Investments	16,654	9,809	7,259
Guarantor Obligations, Maximum Exposure, Undiscounted		2,000
Challenger [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	29,500
Income (Loss) from Equity Method Investments	11,899	8,309	7,000
Green Brick Mortgage, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	4,727	1,053
Providence Group Title, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	12	448
EJB River Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	(2)	(1)
BHome Mortgage [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	18	0
GBTM Sendera [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	0	0
Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Revenues	181,724	166,368	166,102
Costs and Expenses	145,525	144,097	148,222
Net income	36,199	22,271	$ 17,880
Cash	12,765	11,699
Accounts and Other Receivables, Net, Current	1,815	3,252
Financing Receivable, after Allowance for Credit Loss	5,942	5,864
Financing Receivable, Held-for-Sale	14,530	23,143
Inventory, Net	122,819	73,704
Other Assets, Current	8,377	4,012
Assets	166,248	121,674
Accounts Payable, Current	7,171	1,726
Accrued Liabilities, Current	11,148	7,784
Notes Payable, Current	60,642	58,223
Liabilities	78,961	67,733
Stockholders' Equity Attributable to Parent	43,451	25,910
Stockholders' Equity Attributable to Noncontrolling Interest	43,836	28,031
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	87,287	53,941
Liabilities and Equity	166,248	121,674
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	16,654	9,809
EJB River Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	5,296	$ 5,299
Assets	29,200
Liabilities	$ 18,600