Net Income Attributable to Green Brick Partners, Inc. Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Net income attributable to Green Brick Partners, Inc. —basic	$ 4,018	$ 7,349
Weighted-average number of shares outstanding —basic	31,346	11,109
Basic net income attributable to Green Brick Partners, Inc. per share (usd per share)	$ 0.13	$ 0.66
Net income attributable to Green Brick Partners, Inc. —diluted	$ 4,018	$ 7,349
Weighted-average number of shares outstanding —diluted	31,346	11,109
Diluted net income attributable to Green Brick Partners, Inc. per share (usd per share)	$ 0.13	$ 0.66
Antidilutive options to purchase common stock (shares)	158	0