| Document and Entity Information Document And Entity Information | Jan. 27, 2022 |
| Entity Information [Line Items] | |
| Document Period End Date | Jan. 27, 2022 |
| Written Communications | false |
| Written Communications | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| 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) |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001373670 |
| Amendment Flag | false |
| Document Type | 8-K |
| Local Phone Number | 573-6755 |
| Current Fiscal Year End Date | --12-31 |
| Series A Preferred Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Depositary Shares (each representing a 1/1000th interest in a share of 5.75% Series A Cumulative Perpetual Preferred Stock, par value $0.01 per share) |
| Trading Symbol | GRBK PRA |
| Security Exchange Name | NYSE |
| Common Stock | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | GRBK |
| Security Exchange Name | NYSE |
