Net Income Attributable to Green Brick Partners, Inc. Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income attributable to Green Brick Partners, Inc. —basic	$ 2,826	$ 3,694	$ 10,632	$ 18,453
Weighted-average number of shares outstanding —basic (shares)	48,495	11,109	37,125	11,109
Weighted Average Number Diluted Shares Outstanding Adjustment (shares)	100	0	36	0
Basic net income attributable to Green Brick Partners, Inc. per share (usd per share)	$ 0.06	$ 0.33	$ 0.29	$ 1.66
Net income attributable to Green Brick Partners, Inc. —diluted	$ 2,826	$ 3,694	$ 10,632	$ 18,453
Weighted-average number of shares outstanding —diluted (shares)	48,595	11,109	37,161	11,109
Diluted net income attributable to Green Brick Partners, Inc. per share (usd per share)	$ 0.06	$ 0.33	$ 0.29	$ 1.66
Antidilutive options to purchase common stock (shares)	0	0	67	0