Investment in Unconsolidated Entities (Summary of Financial Information of Investment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Assets:
Cash	$ 9,260		$ 9,260		$ 14,584
Accounts receivable	3,525		3,525		1,259
EquityMethodInvestmentsSummarizedFinancialInformationBondsReceivable	5,864		5,864		5,864
EquityMethodInvestmentSummarizedFinancialInformationLoansHeldForSale	8,266		8,266		3,083
Inventory	51,291		51,291		44,375
Other assets	4,390		4,390		3,132
Total assets	82,596		82,596		72,297
Liabilities:
Accounts payable	3,247		3,247		2,173
Accrued expenses and other liabilities	8,086		8,086		5,328
Notes payable	33,991		33,991		31,402
Total liabilities	45,324		45,324		38,903
Owners’ equity:
Green Brick	18,582		18,582		15,653
Others	18,690		18,690		17,741
Total owners’ equity	37,272		37,272		33,394
Total liabilities and owners’ equity	82,596		82,596		$ 72,297
Statements of Income (Unaudited)
Revenues	43,261	$ 43,953	74,358	$ 76,952
Costs and expenses	37,804	39,099	65,121	69,020
Net earnings of unconsolidated entities	5,457	4,854	9,237	7,932
Company’s share in net earnings of unconsolidated entities	$ 2,697	$ 2,279	$ 4,543	$ 3,815