Investment in Unconsolidated Entities (Summary of Financial Information of Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Assets:
Cash	$ 11,642		$ 11,642		$ 14,584
Accounts receivable	2,696		2,696		1,259
EquityMethodInvestmentsSummarizedFinancialInformationBondsReceivable	5,864		5,864		5,864
EquityMethodInvestmentSummarizedFinancialInformationLoansHeldForSale	14,944		14,944		3,083
Inventory	54,032		54,032		44,375
Other assets	4,255		4,255		3,132
Total assets	93,433		93,433		72,297
Liabilities:
Accounts payable	5,835		5,835		2,173
Accrued expenses and other liabilities	7,758		7,758		5,328
Notes payable	39,782		39,782		31,402
Total liabilities	53,375		53,375		38,903
Owners’ equity:
Green Brick	19,971		19,971		15,653
Others	20,087		20,087		17,741
Total owners’ equity	40,058		40,058		33,394
Total liabilities and owners’ equity	93,433		93,433		$ 72,297
Statements of Income (Unaudited)
Revenues	42,428	$ 43,758	116,786	$ 120,710
Costs and expenses	36,227	38,308	101,348	107,328
Net earnings of unconsolidated entities	6,201	5,450	15,438	13,382
Company’s share in net earnings of unconsolidated entities	$ 3,022	$ 2,719	$ 7,565	$ 6,534