Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-17-140829-index-headers.html | 2017-04-27 06:58:11 | |
| 0001193125-17-140829-index.html | 2017-04-27 06:58:11 | |
| 0001193125-17-140829.txt | 2017-04-27 06:58:11 | |
 0001193125-17-140829-xbrl.zip | 184407 | 2017-04-27 06:58:11 |
| d356762d10q.htm | 708080 | 2017-04-27 06:58:11 |
| d356762dex101.htm | 68737 | 2017-04-27 06:58:11 |
| d356762dex11.htm | 8513 | 2017-04-27 06:58:11 |
| d356762dex311.htm | 8795 | 2017-04-27 06:58:11 |
| d356762dex312.htm | 8758 | 2017-04-27 06:58:11 |
| d356762dex313.htm | 8768 | 2017-04-27 06:58:11 |
| d356762dex321.htm | 6835 | 2017-04-27 06:58:11 |
| d356762dex991.htm | 52865 | 2017-04-27 06:58:11 |
| FilingSummary.xml | 29463 | 2017-04-27 06:58:11 |
| Financial_Report.xlsx | 73283 | 2017-04-27 06:58:11 |
 g356762unitil.jpg | 4257 | 2017-04-27 06:58:11 |
| R1.htm | 22047 | 2017-04-27 06:58:11 |
| R10.htm | 34853 | 2017-04-27 06:58:11 |
| R11.htm | 79272 | 2017-04-27 06:58:11 |
| R12.htm | 29748 | 2017-04-27 06:58:11 |
| R13.htm | 40820 | 2017-04-27 06:58:11 |
| R14.htm | 41841 | 2017-04-27 06:58:11 |
| R15.htm | 7808 | 2017-04-27 06:58:11 |
| R16.htm | 47295 | 2017-04-27 06:58:11 |
| R17.htm | 183195 | 2017-04-27 06:58:11 |
| R18.htm | 109265 | 2017-04-27 06:58:11 |
| R19.htm | 9234 | 2017-04-27 06:58:11 |
| R2.htm | 42642 | 2017-04-27 06:58:11 |
| R20.htm | 31327 | 2017-04-27 06:58:11 |
| R21.htm | 74221 | 2017-04-27 06:58:11 |
| R22.htm | 11834 | 2017-04-27 06:58:11 |
| R23.htm | 32784 | 2017-04-27 06:58:11 |
| R24.htm | 44903 | 2017-04-27 06:58:11 |
| R25.htm | 66554 | 2017-04-27 06:58:11 |
| R26.htm | 5167 | 2017-04-27 06:58:11 |
| R27.htm | 9813 | 2017-04-27 06:58:11 |
| R28.htm | 8520 | 2017-04-27 06:58:11 |
| R29.htm | 11473 | 2017-04-27 06:58:11 |
| R3.htm | 118791 | 2017-04-27 06:58:11 |
| R30.htm | 23657 | 2017-04-27 06:58:11 |
| R31.htm | 13039 | 2017-04-27 06:58:11 |
| R32.htm | 14445 | 2017-04-27 06:58:11 |
| R33.htm | 16331 | 2017-04-27 06:58:11 |
| R34.htm | 26867 | 2017-04-27 06:58:11 |
| R35.htm | 24326 | 2017-04-27 06:58:11 |
| R36.htm | 63739 | 2017-04-27 06:58:11 |
| R37.htm | 58771 | 2017-04-27 06:58:11 |
| R38.htm | 6193 | 2017-04-27 06:58:11 |
| R39.htm | 69889 | 2017-04-27 06:58:11 |
| R4.htm | 5244 | 2017-04-27 06:58:11 |
| R40.htm | 13633 | 2017-04-27 06:58:11 |
| R41.htm | 75942 | 2017-04-27 06:58:11 |
| R42.htm | 22395 | 2017-04-27 06:58:11 |
| R43.htm | 154996 | 2017-04-27 06:58:11 |
| R44.htm | 26885 | 2017-04-27 06:58:11 |
| R45.htm | 15273 | 2017-04-27 06:58:11 |
| R46.htm | 16978 | 2017-04-27 06:58:11 |
| R47.htm | 30500 | 2017-04-27 06:58:11 |
| R48.htm | 16349 | 2017-04-27 06:58:11 |
| R5.htm | 72918 | 2017-04-27 06:58:11 |
| R6.htm | 19433 | 2017-04-27 06:58:11 |
| R7.htm | 3842 | 2017-04-27 06:58:11 |
| R8.htm | 143934 | 2017-04-27 06:58:11 |
| R9.htm | 10352 | 2017-04-27 06:58:11 |
| report.css | 2767 | 2017-04-27 06:58:11 |
| Show.js | 1410 | 2017-04-27 06:58:11 |
| utl-20170331.xml | 1422747 | 2017-04-27 06:58:11 |
| utl-20170331.xsd | 61376 | 2017-04-27 06:58:11 |
| utl-20170331_cal.xml | 64567 | 2017-04-27 06:58:11 |
| utl-20170331_def.xml | 361167 | 2017-04-27 06:58:11 |
| utl-20170331_lab.xml | 496432 | 2017-04-27 06:58:11 |
| utl-20170331_pre.xml | 413510 | 2017-04-27 06:58:11 |