Investment in Unconsolidated Entities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 15, 2017
Equity Method Investments and Joint Ventures [Abstract]
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	$ 8,100,000
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	55,616,000	$ 46,443,000
Revenues	1,402,876,000	976,021,000	$ 791,660,000
Net income	204,381,000	117,797,000	64,302,000
Cash	78,696,000	19,479,000	33,269,000	$ 38,315,000
Assets	1,421,867,000	988,847,000
Liabilities	511,306,000	325,895,000
Stockholders' Equity Attributable to Parent	874,548,000	640,242,000	523,168,000	468,351,000
Stockholders' Equity Attributable to Noncontrolling Interest	14,146,000	9,167,000	13,227,000	17,281,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	888,694,000	649,409,000	536,395,000	$ 485,632,000
Liabilities and Equity	1,421,867,000	988,847,000
Income (Loss) from Equity Method Investments	19,713,000	16,654,000	9,809,000
Guarantor Obligations, Maximum Exposure, Undiscounted	2
Contributions from noncontrolling interests	0	400,000	3,600,000
Challenger [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	37,737,000
Income (Loss) from Equity Method Investments	14,831,000	11,899,000	8,300,000
Equity Method Investment, Ownership Percentage					49.90%
Green Brick Mortgage, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 2,464,000	4,727,000
Equity Method Investment, Ownership Percentage	49.00%
Providence Group Title, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 0	12,000
Equity Method Investment, Ownership Percentage	49.00%
EJB River Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 833,000	(2,000)
Equity Method Investment, Ownership Percentage	50.00%
BHome Mortgage [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 1,585,000	18,000
Equity Method Investment, Ownership Percentage	49.00%
GBTM Sendera [Member]
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	$ 0	0
Equity Method Investment, Ownership Percentage	50.00%
Equity Method Investment, Nonconsolidated Investee, Other
Schedule of Equity Method Investments [Line Items]
Revenues	$ 221,190,000	181,724,000	166,368,000
Costs and Expenses	181,429,000	145,525,000	144,097,000
Net income	39,761,000	36,199,000	$ 22,271,000
Cash	15,903,000	12,765,000
Accounts and Other Receivables, Net, Current	4,787,000	1,815,000
Financing Receivable, after Allowance for Credit Loss	5,772,000	5,942,000
Financing Receivable, Held-for-Sale	20,734,000	14,530,000
Inventory, Net	166,861,000	122,819,000
Other Assets, Current	7,220,000	8,377,000
Assets	221,277,000	166,248,000
Accounts Payable, Current	7,701,000	7,171,000
Accrued Liabilities, Current	13,992,000	11,148,000
Notes Payable, Current	95,816,000	60,642,000
Liabilities	117,509,000	78,961,000
Stockholders' Equity Attributable to Parent	52,983,000	43,451,000
Stockholders' Equity Attributable to Noncontrolling Interest	50,785,000	43,836,000
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	103,768,000	87,287,000
Liabilities and Equity	221,277,000	166,248,000
Equity Method Investments
Schedule of Equity Method Investments [Line Items]
Income (Loss) from Equity Method Investments	19,713,000	16,654,000
EJB River Holdings, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	6,130,000	5,296,000
Assets	29,100,000
Liabilities	16,900,000
Challenger [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		29,488,000
Income (Loss) from Equity Method Investments	14,800,000	11,900,000
GBTM Sendera [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	9,854,000	9,846,000
Contributions of LLC Members		9,000,000
Net Assets	19,700,000
BHome Mortgage [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments	$ 1,180,000	606,000
Contributions of LLC Members		$ 500,000