Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2019	Aug. 05, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	Green Brick Partners, Inc.
Entity Central Index Key	0001373670
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Tax Identification Number	205952523
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		50,551,427
Entity Shell Company	false
Entity File Number	001-33530
Entity Address, Address Line One	2805 Dallas Parkway
Entity Address, Address Line Two	Suite 400
Entity Address, City or Town	Plano
Entity Address, State or Province	Texas
Entity Address, Postal Zip Code	75093
City Area Code	469
Local Phone Number	573-6755