Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001373670-20-000032-index-headers.html | 2020-05-11 17:00:56 | |
| 0001373670-20-000032-index.html | 2020-05-11 17:00:56 | |
| 0001373670-20-000032.txt | 2020-05-11 17:00:56 | |
 0001373670-20-000032-xbrl.zip | 220390 | 2020-05-11 17:00:56 |
| exhibit311certificatio.htm | 12671 | 2020-05-11 17:00:56 |
| exhibit312certificatio.htm | 12656 | 2020-05-11 17:00:56 |
| exhibit321certificatio.htm | 6151 | 2020-05-11 17:00:56 |
| exhibit322certificatio.htm | 6163 | 2020-05-11 17:00:56 |
| FilingSummary.xml | 31614 | 2020-05-11 17:00:56 |
| Financial_Report.xlsx | 58592 | 2020-05-11 17:00:56 |
| grbk-20200331.htm | 1519436 | 2020-05-11 17:00:56 |
| grbk-20200331.xsd | 30201 | 2020-05-11 17:00:56 |
| grbk-20200331_cal.xml | 68140 | 2020-05-11 17:00:56 |
| grbk-20200331_def.xml | 225600 | 2020-05-11 17:00:56 |
| grbk-20200331_htm.xml | 1192351 | 2020-05-11 17:00:56 |
| grbk-20200331_lab.xml | 506872 | 2020-05-11 17:00:56 |
| grbk-20200331_pre.xml | 377975 | 2020-05-11 17:00:56 |
| MetaLinks.json | 546915 | 2020-05-11 17:00:56 |
| R1.htm | 54048 | 2020-05-11 17:00:56 |
| R10.htm | 32648 | 2020-05-11 17:00:56 |
| R11.htm | 57106 | 2020-05-11 17:00:56 |
| R12.htm | 21588 | 2020-05-11 17:00:56 |
| R13.htm | 19976 | 2020-05-11 17:00:56 |
| R14.htm | 35046 | 2020-05-11 17:00:56 |
| R15.htm | 79332 | 2020-05-11 17:00:56 |
| R16.htm | 8394 | 2020-05-11 17:00:56 |
| R17.htm | 42369 | 2020-05-11 17:00:56 |
| R18.htm | 5007 | 2020-05-11 17:00:56 |
| R19.htm | 11248 | 2020-05-11 17:00:56 |
| R2.htm | 105873 | 2020-05-11 17:00:56 |
| R20.htm | 17217 | 2020-05-11 17:00:56 |
| R21.htm | 30529 | 2020-05-11 17:00:56 |
| R22.htm | 29857 | 2020-05-11 17:00:56 |
| R23.htm | 56990 | 2020-05-11 17:00:56 |
| R24.htm | 15283 | 2020-05-11 17:00:56 |
| R25.htm | 5971 | 2020-05-11 17:00:56 |
| R26.htm | 30115 | 2020-05-11 17:00:56 |
| R27.htm | 76334 | 2020-05-11 17:00:56 |
| R28.htm | 17580 | 2020-05-11 17:00:56 |
| R29.htm | 6197 | 2020-05-11 17:00:56 |
| R3.htm | 19054 | 2020-05-11 17:00:56 |
| R30.htm | 33770 | 2020-05-11 17:00:56 |
| R31.htm | 29732 | 2020-05-11 17:00:56 |
| R32.htm | 4921 | 2020-05-11 17:00:56 |
| R33.htm | 14054 | 2020-05-11 17:00:56 |
| R34.htm | 11081 | 2020-05-11 17:00:56 |
| R35.htm | 259918 | 2020-05-11 17:00:56 |
| R36.htm | 25795 | 2020-05-11 17:00:56 |
| R37.htm | 88076 | 2020-05-11 17:00:56 |
| R38.htm | 13589 | 2020-05-11 17:00:56 |
| R39.htm | 24956 | 2020-05-11 17:00:56 |
| R4.htm | 75476 | 2020-05-11 17:00:56 |
| R40.htm | 47196 | 2020-05-11 17:00:56 |
| R41.htm | 6435 | 2020-05-11 17:00:56 |
| R42.htm | 12265 | 2020-05-11 17:00:56 |
| R43.htm | 22017 | 2020-05-11 17:00:56 |
| R44.htm | 14904 | 2020-05-11 17:00:56 |
| R45.htm | 15078 | 2020-05-11 17:00:56 |
| R46.htm | 58552 | 2020-05-11 17:00:56 |
| R47.htm | 19238 | 2020-05-11 17:00:56 |
| R48.htm | 45624 | 2020-05-11 17:00:56 |
| R5.htm | 89384 | 2020-05-11 17:00:56 |
| R6.htm | 91707 | 2020-05-11 17:00:56 |
| R7.htm | 32329 | 2020-05-11 17:00:56 |
| R8.htm | 20326 | 2020-05-11 17:00:56 |
| R9.htm | 29845 | 2020-05-11 17:00:56 |
| report.css | 2767 | 2020-05-11 17:00:56 |
| Show.js | 1085 | 2020-05-11 17:00:56 |