Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001373670-21-000035-index-headers.html | 2021-11-02 16:31:20 | |
| 0001373670-21-000035-index.html | 2021-11-02 16:31:20 | |
| 0001373670-21-000035.txt | 2021-11-02 16:31:20 | |
 0001373670-21-000035-xbrl.zip | 242004 | 2021-11-02 16:31:20 |
| exhibit311certificationofc.htm | 10795 | 2021-11-02 16:31:20 |
| exhibit312certificationofc.htm | 10764 | 2021-11-02 16:31:20 |
| exhibit321certificationofc.htm | 5004 | 2021-11-02 16:31:20 |
| exhibit322certificationofc.htm | 4999 | 2021-11-02 16:31:20 |
| FilingSummary.xml | 32694 | 2021-11-02 16:31:20 |
| Financial_Report.xlsx | 78526 | 2021-11-02 16:31:20 |
| grbk-20210930.htm | 1655538 | 2021-11-02 16:31:20 |
| grbk-20210930.xsd | 34413 | 2021-11-02 16:31:20 |
| grbk-20210930_cal.xml | 57817 | 2021-11-02 16:31:20 |
| grbk-20210930_def.xml | 214133 | 2021-11-02 16:31:20 |
| grbk-20210930_htm.xml | 1341805 | 2021-11-02 16:31:20 |
| grbk-20210930_lab.xml | 522855 | 2021-11-02 16:31:20 |
| grbk-20210930_pre.xml | 401323 | 2021-11-02 16:31:20 |
| MetaLinks.json | 582124 | 2021-11-02 16:31:20 |
| R1.htm | 54013 | 2021-11-02 16:31:20 |
| R10.htm | 23407 | 2021-11-02 16:31:20 |
| R11.htm | 21831 | 2021-11-02 16:31:20 |
| R12.htm | 9929 | 2021-11-02 16:31:20 |
| R13.htm | 29947 | 2021-11-02 16:31:20 |
| R14.htm | 72854 | 2021-11-02 16:31:20 |
| R15.htm | 7900 | 2021-11-02 16:31:20 |
| R16.htm | 32634 | 2021-11-02 16:31:20 |
| R17.htm | 13671 | 2021-11-02 16:31:20 |
| R18.htm | 8226 | 2021-11-02 16:31:20 |
| R19.htm | 34261 | 2021-11-02 16:31:20 |
| R2.htm | 116834 | 2021-11-02 16:31:20 |
| R20.htm | 10957 | 2021-11-02 16:31:20 |
| R21.htm | 40284 | 2021-11-02 16:31:20 |
| R22.htm | 26881 | 2021-11-02 16:31:20 |
| R23.htm | 11613 | 2021-11-02 16:31:20 |
| R24.htm | 12775 | 2021-11-02 16:31:20 |
| R25.htm | 13168 | 2021-11-02 16:31:20 |
| R26.htm | 69856 | 2021-11-02 16:31:20 |
| R27.htm | 33459 | 2021-11-02 16:31:20 |
| R28.htm | 28804 | 2021-11-02 16:31:20 |
| R29.htm | 6202 | 2021-11-02 16:31:20 |
| R3.htm | 19667 | 2021-11-02 16:31:20 |
| R30.htm | 117777 | 2021-11-02 16:31:20 |
| R31.htm | 14439 | 2021-11-02 16:31:20 |
| R32.htm | 29157 | 2021-11-02 16:31:20 |
| R33.htm | 16292 | 2021-11-02 16:31:20 |
| R34.htm | 13455 | 2021-11-02 16:31:20 |
| R35.htm | 31071 | 2021-11-02 16:31:20 |
| R36.htm | 60885 | 2021-11-02 16:31:20 |
| R37.htm | 48493 | 2021-11-02 16:31:20 |
| R38.htm | 3865 | 2021-11-02 16:31:20 |
| R39.htm | 48639 | 2021-11-02 16:31:20 |
| R4.htm | 92919 | 2021-11-02 16:31:20 |
| R40.htm | 270076 | 2021-11-02 16:31:20 |
| R41.htm | 24126 | 2021-11-02 16:31:20 |
| R42.htm | 86920 | 2021-11-02 16:31:20 |
| R43.htm | 8803 | 2021-11-02 16:31:20 |
| R44.htm | 35487 | 2021-11-02 16:31:20 |
| R45.htm | 5226 | 2021-11-02 16:31:20 |
| R46.htm | 13020 | 2021-11-02 16:31:20 |
| R47.htm | 23308 | 2021-11-02 16:31:20 |
| R48.htm | 17765 | 2021-11-02 16:31:20 |
| R49.htm | 24197 | 2021-11-02 16:31:20 |
| R5.htm | 185533 | 2021-11-02 16:31:20 |
| R50.htm | 15849 | 2021-11-02 16:31:20 |
| R6.htm | 108934 | 2021-11-02 16:31:20 |
| R7.htm | 21670 | 2021-11-02 16:31:20 |
| R8.htm | 49135 | 2021-11-02 16:31:20 |
| R9.htm | 26759 | 2021-11-02 16:31:20 |
| report.css | 2767 | 2021-11-02 16:31:20 |
| Show.js | 1085 | 2021-11-02 16:31:20 |