Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-19-008251-index-headers.html | 2019-03-18 16:02:02 | |
| 0001564590-19-008251-index.html | 2019-03-18 16:02:02 | |
| 0001564590-19-008251.txt | 2019-03-18 16:02:02 | |
 0001564590-19-008251-xbrl.zip | 204016 | 2019-03-18 16:02:02 |
| FilingSummary.xml | 49318 | 2019-03-18 16:02:02 |
| Financial_Report.xlsx | 93903 | 2019-03-18 16:02:02 |
| mktx-10ka_20181231.htm | 52502 | 2019-03-18 16:02:02 |
| mktx-20181231.xml | 3427171 | 2019-03-18 16:02:02 |
| mktx-20181231.xsd | 70562 | 2019-03-18 16:02:02 |
| mktx-20181231_cal.xml | 76736 | 2019-03-18 16:02:02 |
| mktx-20181231_def.xml | 282695 | 2019-03-18 16:02:02 |
| mktx-20181231_lab.xml | 543009 | 2019-03-18 16:02:02 |
| mktx-20181231_pre.xml | 430353 | 2019-03-18 16:02:02 |
| mktx-ex311_8.htm | 3836 | 2019-03-18 16:02:02 |
| mktx-ex312_7.htm | 4066 | 2019-03-18 16:02:02 |
| R1.htm | 38738 | 2019-03-18 16:02:02 |
| R10.htm | 191387 | 2019-03-18 16:02:02 |
| R11.htm | 6412 | 2019-03-18 16:02:02 |
| R12.htm | 389504 | 2019-03-18 16:02:02 |
| R13.htm | 75439 | 2019-03-18 16:02:02 |
| R14.htm | 43134 | 2019-03-18 16:02:02 |
| R15.htm | 248406 | 2019-03-18 16:02:02 |
| R16.htm | 48493 | 2019-03-18 16:02:02 |
| R17.htm | 291860 | 2019-03-18 16:02:02 |
| R18.htm | 31359 | 2019-03-18 16:02:02 |
| R19.htm | 8729 | 2019-03-18 16:02:02 |
| R2.htm | 66049 | 2019-03-18 16:02:02 |
| R20.htm | 27095 | 2019-03-18 16:02:02 |
| R21.htm | 65857 | 2019-03-18 16:02:02 |
| R22.htm | 7405 | 2019-03-18 16:02:02 |
| R23.htm | 239129 | 2019-03-18 16:02:02 |
| R24.htm | 165893 | 2019-03-18 16:02:02 |
| R25.htm | 394434 | 2019-03-18 16:02:02 |
| R26.htm | 74581 | 2019-03-18 16:02:02 |
| R27.htm | 42428 | 2019-03-18 16:02:02 |
| R28.htm | 253124 | 2019-03-18 16:02:02 |
| R29.htm | 44836 | 2019-03-18 16:02:02 |
| R3.htm | 27377 | 2019-03-18 16:02:02 |
| R30.htm | 289784 | 2019-03-18 16:02:02 |
| R31.htm | 30937 | 2019-03-18 16:02:02 |
| R32.htm | 19472 | 2019-03-18 16:02:02 |
| R33.htm | 64382 | 2019-03-18 16:02:02 |
| R34.htm | 7276 | 2019-03-18 16:02:02 |
| R35.htm | 42297 | 2019-03-18 16:02:02 |
| R36.htm | 14758 | 2019-03-18 16:02:02 |
| R37.htm | 12265 | 2019-03-18 16:02:02 |
| R38.htm | 12253 | 2019-03-18 16:02:02 |
| R39.htm | 16777 | 2019-03-18 16:02:02 |
| R4.htm | 71551 | 2019-03-18 16:02:02 |
| R40.htm | 7826 | 2019-03-18 16:02:02 |
| R41.htm | 5910 | 2019-03-18 16:02:02 |
| R42.htm | 30797 | 2019-03-18 16:02:02 |
| R43.htm | 6120 | 2019-03-18 16:02:02 |
| R44.htm | 9968 | 2019-03-18 16:02:02 |
| R45.htm | 34831 | 2019-03-18 16:02:02 |
| R46.htm | 7639 | 2019-03-18 16:02:02 |
| R47.htm | 16950 | 2019-03-18 16:02:02 |
| R48.htm | 21444 | 2019-03-18 16:02:02 |
| R49.htm | 18999 | 2019-03-18 16:02:02 |
| R5.htm | 14313 | 2019-03-18 16:02:02 |
| R50.htm | 21631 | 2019-03-18 16:02:02 |
| R51.htm | 4479 | 2019-03-18 16:02:02 |
| R52.htm | 27483 | 2019-03-18 16:02:02 |
| R53.htm | 39572 | 2019-03-18 16:02:02 |
| R54.htm | 24768 | 2019-03-18 16:02:02 |
| R55.htm | 31837 | 2019-03-18 16:02:02 |
| R56.htm | 8723 | 2019-03-18 16:02:02 |
| R57.htm | 9061 | 2019-03-18 16:02:02 |
| R58.htm | 40150 | 2019-03-18 16:02:02 |
| R59.htm | 16282 | 2019-03-18 16:02:02 |
| R6.htm | 8078 | 2019-03-18 16:02:02 |
| R60.htm | 110186 | 2019-03-18 16:02:02 |
| R61.htm | 16250 | 2019-03-18 16:02:02 |
| R62.htm | 11815 | 2019-03-18 16:02:02 |
| R63.htm | 37328 | 2019-03-18 16:02:02 |
| R64.htm | 10761 | 2019-03-18 16:02:02 |
| R65.htm | 18747 | 2019-03-18 16:02:02 |
| R66.htm | 10006 | 2019-03-18 16:02:02 |
| R67.htm | 7086 | 2019-03-18 16:02:02 |
| R68.htm | 24317 | 2019-03-18 16:02:02 |
| R69.htm | 29458 | 2019-03-18 16:02:02 |
| R7.htm | 41971 | 2019-03-18 16:02:02 |
| R70.htm | 19407 | 2019-03-18 16:02:02 |
| R71.htm | 12049 | 2019-03-18 16:02:02 |
| R72.htm | 16283 | 2019-03-18 16:02:02 |
| R73.htm | 10047 | 2019-03-18 16:02:02 |
| R8.htm | 81005 | 2019-03-18 16:02:02 |
| R9.htm | 6752 | 2019-03-18 16:02:02 |
| report.css | 2767 | 2019-03-18 16:02:02 |
| Show.js | 1085 | 2019-03-18 16:02:02 |