| Document and Entity Information Document And Entity Information | Oct. 29, 2020 |
| Entity Information [Line Items] | |
| Document Period End Date | Oct. 29, 2020 |
| Written Communications | false |
| Written Communications | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Entity Registrant Name | Green Brick Partners, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-33530 |
| Entity Tax Identification Number | 20-5952523 |
| Entity Address, Address Line One | 2805 Dallas Pkwy |
| Entity Address, Address Line Two | Ste 400 |
| Entity Address, City or Town | Plano |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 75093 |
| City Area Code | (469) |
| Trading Symbol | GRBK |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001373670 |
| Amendment Flag | false |
| Document Type | 8-K |
| Local Phone Number | 573-6755 |
