Net Income Attributable to Green Brick Partners, Inc. Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to Green Brick Partners, Inc.	$ 15,917	$ 12,605
Weighted-average number of shares outstanding —basic (in shares)	50,454	50,563
Basic net income attributable to Green Brick Partners, Inc. per share (in dollars per share)	$ 0.32	$ 0.25
Dilutive effect of stock options and restricted stock awards (in shares)	192	42
Weighted-average number of shares outstanding —diluted (in shares)	50,646	50,605
Diluted net income attributable to Green Brick Partners, Inc. per share (in dollars per share)	$ 0.31	$ 0.25