Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001620459-21-000097-index-headers.html | 2021-11-03 16:13:22 | |
| 0001620459-21-000097-index.html | 2021-11-03 16:13:22 | |
| 0001620459-21-000097.txt | 2021-11-03 16:13:22 | |
 0001620459-21-000097-xbrl.zip | 381231 | 2021-11-03 16:13:22 |
| a3q21jrvrex311.htm | 11323 | 2021-11-03 16:13:22 |
| a3q21jrvrex312.htm | 11321 | 2021-11-03 16:13:22 |
| a3q21jrvrex32.htm | 9054 | 2021-11-03 16:13:22 |
| FilingSummary.xml | 38786 | 2021-11-03 16:13:22 |
| Financial_Report.xlsx | 106671 | 2021-11-03 16:13:22 |
| jrvr-20210930.htm | 2996766 | 2021-11-03 16:13:22 |
| jrvr-20210930.xsd | 54376 | 2021-11-03 16:13:22 |
| jrvr-20210930_cal.xml | 97561 | 2021-11-03 16:13:22 |
| jrvr-20210930_def.xml | 324335 | 2021-11-03 16:13:22 |
| jrvr-20210930_htm.xml | 2564134 | 2021-11-03 16:13:22 |
| jrvr-20210930_lab.xml | 711705 | 2021-11-03 16:13:22 |
| jrvr-20210930_pre.xml | 512834 | 2021-11-03 16:13:22 |
| MetaLinks.json | 742175 | 2021-11-03 16:13:22 |
| R1.htm | 55327 | 2021-11-03 16:13:22 |
| R10.htm | 224100 | 2021-11-03 16:13:22 |
| R11.htm | 27308 | 2021-11-03 16:13:22 |
| R12.htm | 28663 | 2021-11-03 16:13:22 |
| R13.htm | 40218 | 2021-11-03 16:13:22 |
| R14.htm | 27224 | 2021-11-03 16:13:22 |
| R15.htm | 14128 | 2021-11-03 16:13:22 |
| R16.htm | 138164 | 2021-11-03 16:13:22 |
| R17.htm | 19104 | 2021-11-03 16:13:22 |
| R18.htm | 132678 | 2021-11-03 16:13:22 |
| R19.htm | 10441 | 2021-11-03 16:13:22 |
| R2.htm | 110107 | 2021-11-03 16:13:22 |
| R20.htm | 80037 | 2021-11-03 16:13:22 |
| R21.htm | 5949 | 2021-11-03 16:13:22 |
| R22.htm | 19799 | 2021-11-03 16:13:22 |
| R23.htm | 258055 | 2021-11-03 16:13:22 |
| R24.htm | 51912 | 2021-11-03 16:13:22 |
| R25.htm | 26961 | 2021-11-03 16:13:22 |
| R26.htm | 33634 | 2021-11-03 16:13:22 |
| R27.htm | 24399 | 2021-11-03 16:13:22 |
| R28.htm | 136523 | 2021-11-03 16:13:22 |
| R29.htm | 18326 | 2021-11-03 16:13:22 |
| R3.htm | 24056 | 2021-11-03 16:13:22 |
| R30.htm | 126310 | 2021-11-03 16:13:22 |
| R31.htm | 75625 | 2021-11-03 16:13:22 |
| R32.htm | 27531 | 2021-11-03 16:13:22 |
| R33.htm | 31466 | 2021-11-03 16:13:22 |
| R34.htm | 37280 | 2021-11-03 16:13:22 |
| R35.htm | 41336 | 2021-11-03 16:13:22 |
| R36.htm | 64217 | 2021-11-03 16:13:22 |
| R37.htm | 34207 | 2021-11-03 16:13:22 |
| R38.htm | 65077 | 2021-11-03 16:13:22 |
| R39.htm | 9738 | 2021-11-03 16:13:22 |
| R4.htm | 98403 | 2021-11-03 16:13:22 |
| R40.htm | 20751 | 2021-11-03 16:13:22 |
| R41.htm | 40186 | 2021-11-03 16:13:22 |
| R42.htm | 6993 | 2021-11-03 16:13:22 |
| R43.htm | 31510 | 2021-11-03 16:13:22 |
| R44.htm | 30512 | 2021-11-03 16:13:22 |
| R45.htm | 25223 | 2021-11-03 16:13:22 |
| R46.htm | 9766 | 2021-11-03 16:13:22 |
| R47.htm | 54834 | 2021-11-03 16:13:22 |
| R48.htm | 12954 | 2021-11-03 16:13:22 |
| R49.htm | 58008 | 2021-11-03 16:13:22 |
| R5.htm | 5722 | 2021-11-03 16:13:22 |
| R50.htm | 35057 | 2021-11-03 16:13:22 |
| R51.htm | 15278 | 2021-11-03 16:13:22 |
| R52.htm | 79363 | 2021-11-03 16:13:22 |
| R53.htm | 25764 | 2021-11-03 16:13:22 |
| R54.htm | 12731 | 2021-11-03 16:13:22 |
| R55.htm | 39882 | 2021-11-03 16:13:22 |
| R56.htm | 27493 | 2021-11-03 16:13:22 |
| R57.htm | 34948 | 2021-11-03 16:13:22 |
| R58.htm | 9313 | 2021-11-03 16:13:22 |
| R59.htm | 11940 | 2021-11-03 16:13:22 |
| R6.htm | 77790 | 2021-11-03 16:13:22 |
| R60.htm | 36906 | 2021-11-03 16:13:22 |
| R61.htm | 29732 | 2021-11-03 16:13:22 |
| R62.htm | 7565 | 2021-11-03 16:13:22 |
| R63.htm | 8274 | 2021-11-03 16:13:22 |
| R64.htm | 26658 | 2021-11-03 16:13:22 |
| R7.htm | 76620 | 2021-11-03 16:13:22 |
| R8.htm | 8647 | 2021-11-03 16:13:22 |
| R9.htm | 16692 | 2021-11-03 16:13:22 |
| report.css | 2767 | 2021-11-03 16:13:22 |
| Show.js | 1085 | 2021-11-03 16:13:22 |