Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001692115-19-000013-index-headers.html | 2019-02-28 09:53:59 | |
| 0001692115-19-000013-index.html | 2019-02-28 09:53:59 | |
| 0001692115-19-000013.txt | 2019-02-28 09:53:59 | |
 0001692115-19-000013-xbrl.zip | 613011 | 2019-02-28 09:53:59 |
| FilingSummary.xml | 83391 | 2019-02-28 09:53:59 |
| Financial_Report.xlsx | 207455 | 2019-02-28 09:53:59 |
| R1.htm | 43240 | 2019-02-28 09:53:59 |
| R10.htm | 77456 | 2019-02-28 09:53:59 |
| R100.htm | 38625 | 2019-02-28 09:53:59 |
| R101.htm | 28855 | 2019-02-28 09:53:59 |
| R102.htm | 27009 | 2019-02-28 09:53:59 |
| R103.htm | 49110 | 2019-02-28 09:53:59 |
| R104.htm | 22758 | 2019-02-28 09:53:59 |
| R105.htm | 15581 | 2019-02-28 09:53:59 |
| R106.htm | 22859 | 2019-02-28 09:53:59 |
| R107.htm | 14999 | 2019-02-28 09:53:59 |
| R108.htm | 4457 | 2019-02-28 09:53:59 |
| R109.htm | 10517 | 2019-02-28 09:53:59 |
| R11.htm | 120997 | 2019-02-28 09:53:59 |
| R110.htm | 20715 | 2019-02-28 09:53:59 |
| R111.htm | 6650 | 2019-02-28 09:53:59 |
| R112.htm | 11204 | 2019-02-28 09:53:59 |
| R113.htm | 19663 | 2019-02-28 09:53:59 |
| R114.htm | 11780 | 2019-02-28 09:53:59 |
| R115.htm | 7474 | 2019-02-28 09:53:59 |
| R116.htm | 13551 | 2019-02-28 09:53:59 |
| R117.htm | 77116 | 2019-02-28 09:53:59 |
| R118.htm | 45058 | 2019-02-28 09:53:59 |
| R119.htm | 26953 | 2019-02-28 09:53:59 |
| R12.htm | 34669 | 2019-02-28 09:53:59 |
| R120.htm | 20658 | 2019-02-28 09:53:59 |
| R121.htm | 43533 | 2019-02-28 09:53:59 |
| R122.htm | 65715 | 2019-02-28 09:53:59 |
| R123.htm | 51308 | 2019-02-28 09:53:59 |
| R124.htm | 16534 | 2019-02-28 09:53:59 |
| R125.htm | 16385 | 2019-02-28 09:53:59 |
| R13.htm | 93577 | 2019-02-28 09:53:59 |
| R14.htm | 353126 | 2019-02-28 09:53:59 |
| R15.htm | 39961 | 2019-02-28 09:53:59 |
| R16.htm | 178144 | 2019-02-28 09:53:59 |
| R17.htm | 11357 | 2019-02-28 09:53:59 |
| R18.htm | 8355 | 2019-02-28 09:53:59 |
| R19.htm | 474806 | 2019-02-28 09:53:59 |
| R2.htm | 128010 | 2019-02-28 09:53:59 |
| R20.htm | 97598 | 2019-02-28 09:53:59 |
| R21.htm | 324964 | 2019-02-28 09:53:59 |
| R22.htm | 121564 | 2019-02-28 09:53:59 |
| R23.htm | 177671 | 2019-02-28 09:53:59 |
| R24.htm | 179416 | 2019-02-28 09:53:59 |
| R25.htm | 22687 | 2019-02-28 09:53:59 |
| R26.htm | 24086 | 2019-02-28 09:53:59 |
| R27.htm | 80532 | 2019-02-28 09:53:59 |
| R28.htm | 162671 | 2019-02-28 09:53:59 |
| R29.htm | 195484 | 2019-02-28 09:53:59 |
| R3.htm | 10731 | 2019-02-28 09:53:59 |
| R30.htm | 79737 | 2019-02-28 09:53:59 |
| R31.htm | 99190 | 2019-02-28 09:53:59 |
| R32.htm | 33724 | 2019-02-28 09:53:59 |
| R33.htm | 225254 | 2019-02-28 09:53:59 |
| R34.htm | 450147 | 2019-02-28 09:53:59 |
| R35.htm | 32061 | 2019-02-28 09:53:59 |
| R36.htm | 165225 | 2019-02-28 09:53:59 |
| R37.htm | 490475 | 2019-02-28 09:53:59 |
| R38.htm | 94159 | 2019-02-28 09:53:59 |
| R39.htm | 319676 | 2019-02-28 09:53:59 |
| R4.htm | 96256 | 2019-02-28 09:53:59 |
| R40.htm | 126715 | 2019-02-28 09:53:59 |
| R41.htm | 179762 | 2019-02-28 09:53:59 |
| R42.htm | 178715 | 2019-02-28 09:53:59 |
| R43.htm | 16230 | 2019-02-28 09:53:59 |
| R44.htm | 25627 | 2019-02-28 09:53:59 |
| R45.htm | 67477 | 2019-02-28 09:53:59 |
| R46.htm | 77260 | 2019-02-28 09:53:59 |
| R47.htm | 16627 | 2019-02-28 09:53:59 |
| R48.htm | 22464 | 2019-02-28 09:53:59 |
| R49.htm | 20909 | 2019-02-28 09:53:59 |
| R5.htm | 64007 | 2019-02-28 09:53:59 |
| R50.htm | 18877 | 2019-02-28 09:53:59 |
| R51.htm | 12206 | 2019-02-28 09:53:59 |
| R52.htm | 35894 | 2019-02-28 09:53:59 |
| R53.htm | 18126 | 2019-02-28 09:53:59 |
| R54.htm | 21904 | 2019-02-28 09:53:59 |
| R55.htm | 12224 | 2019-02-28 09:53:59 |
| R56.htm | 7780 | 2019-02-28 09:53:59 |
| R57.htm | 9363 | 2019-02-28 09:53:59 |
| R58.htm | 26752 | 2019-02-28 09:53:59 |
| R59.htm | 28916 | 2019-02-28 09:53:59 |
| R6.htm | 141957 | 2019-02-28 09:53:59 |
| R60.htm | 24600 | 2019-02-28 09:53:59 |
| R61.htm | 25697 | 2019-02-28 09:53:59 |
| R62.htm | 10636 | 2019-02-28 09:53:59 |
| R63.htm | 9096 | 2019-02-28 09:53:59 |
| R64.htm | 13946 | 2019-02-28 09:53:59 |
| R65.htm | 4134 | 2019-02-28 09:53:59 |
| R66.htm | 8920 | 2019-02-28 09:53:59 |
| R67.htm | 10359 | 2019-02-28 09:53:59 |
| R68.htm | 7171 | 2019-02-28 09:53:59 |
| R69.htm | 38830 | 2019-02-28 09:53:59 |
| R7.htm | 109919 | 2019-02-28 09:53:59 |
| R70.htm | 22839 | 2019-02-28 09:53:59 |
| R71.htm | 22707 | 2019-02-28 09:53:59 |
| R72.htm | 76763 | 2019-02-28 09:53:59 |
| R73.htm | 7791 | 2019-02-28 09:53:59 |
| R74.htm | 12130 | 2019-02-28 09:53:59 |
| R75.htm | 120591 | 2019-02-28 09:53:59 |
| R76.htm | 11742 | 2019-02-28 09:53:59 |
| R77.htm | 41716 | 2019-02-28 09:53:59 |
| R78.htm | 132433 | 2019-02-28 09:53:59 |
| R79.htm | 82152 | 2019-02-28 09:53:59 |
| R8.htm | 8838 | 2019-02-28 09:53:59 |
| R80.htm | 13184 | 2019-02-28 09:53:59 |
| R81.htm | 21017 | 2019-02-28 09:53:59 |
| R82.htm | 26777 | 2019-02-28 09:53:59 |
| R83.htm | 9233 | 2019-02-28 09:53:59 |
| R84.htm | 23429 | 2019-02-28 09:53:59 |
| R85.htm | 4568 | 2019-02-28 09:53:59 |
| R86.htm | 9082 | 2019-02-28 09:53:59 |
| R87.htm | 56679 | 2019-02-28 09:53:59 |
| R88.htm | 8335 | 2019-02-28 09:53:59 |
| R89.htm | 22699 | 2019-02-28 09:53:59 |
| R9.htm | 253952 | 2019-02-28 09:53:59 |
| R90.htm | 18953 | 2019-02-28 09:53:59 |
| R91.htm | 42335 | 2019-02-28 09:53:59 |
| R92.htm | 36515 | 2019-02-28 09:53:59 |
| R93.htm | 64826 | 2019-02-28 09:53:59 |
| R94.htm | 40876 | 2019-02-28 09:53:59 |
| R95.htm | 6927 | 2019-02-28 09:53:59 |
| R96.htm | 24022 | 2019-02-28 09:53:59 |
| R97.htm | 4290 | 2019-02-28 09:53:59 |
| R98.htm | 38274 | 2019-02-28 09:53:59 |
| R99.htm | 9275 | 2019-02-28 09:53:59 |
| report.css | 2768 | 2019-02-28 09:53:59 |
| Show.js | 1086 | 2019-02-28 09:53:59 |
| swx-20181231.xml | 7216184 | 2019-02-28 09:53:59 |
| swx-20181231.xsd | 126782 | 2019-02-28 09:53:59 |
| swx-20181231_cal.xml | 239191 | 2019-02-28 09:53:59 |
| swx-20181231_def.xml | 829944 | 2019-02-28 09:53:59 |
| swx-20181231_lab.xml | 1509126 | 2019-02-28 09:53:59 |
| swx-20181231_pre.xml | 1031807 | 2019-02-28 09:53:59 |
| swx12311810k.htm | 639426 | 2019-02-28 09:53:59 |
| swx123118ex1002.htm | 96569 | 2019-02-28 09:53:59 |
| swx123118ex1003.htm | 125622 | 2019-02-28 09:53:59 |
| swx123118ex1004.htm | 264559 | 2019-02-28 09:53:59 |
| swx123118ex1005.htm | 99250 | 2019-02-28 09:53:59 |
| swx123118ex1014.htm | 96795 | 2019-02-28 09:53:59 |
| swx123118ex1028.htm | 85001 | 2019-02-28 09:53:59 |
| swx123118ex1029.htm | 120581 | 2019-02-28 09:53:59 |
| swx123118ex1030.htm | 1356375 | 2019-02-28 09:53:59 |
| swx123118ex1301.htm | 4043659 | 2019-02-28 09:53:59 |
| swx123118ex2101.htm | 15362 | 2019-02-28 09:53:59 |
| swx123118ex2301.htm | 2332 | 2019-02-28 09:53:59 |
| swx123118ex2302.htm | 2130 | 2019-02-28 09:53:59 |
| swx123118ex3101.htm | 31953 | 2019-02-28 09:53:59 |
| swx123118ex3102.htm | 42777 | 2019-02-28 09:53:59 |
| swx123118ex3201.htm | 12123 | 2019-02-28 09:53:59 |
| swx123118ex3202.htm | 21259 | 2019-02-28 09:53:59 |