Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-18-042819-index-headers.html | 2018-02-13 17:10:41 | |
| 0001193125-18-042819-index.html | 2018-02-13 17:10:41 | |
| 0001193125-18-042819.txt | 2018-02-13 17:10:41 | |
 0001193125-18-042819-xbrl.zip | 291848 | 2018-02-13 17:10:41 |
| bxmt-20171231.xml | 2288281 | 2018-02-13 17:10:41 |
| bxmt-20171231.xsd | 116835 | 2018-02-13 17:10:41 |
| bxmt-20171231_cal.xml | 103202 | 2018-02-13 17:10:41 |
| bxmt-20171231_def.xml | 494678 | 2018-02-13 17:10:41 |
| bxmt-20171231_lab.xml | 770577 | 2018-02-13 17:10:41 |
| bxmt-20171231_pre.xml | 694654 | 2018-02-13 17:10:41 |
| d470827d10k.htm | 1981808 | 2018-02-13 17:10:41 |
| d470827dex102.htm | 43274 | 2018-02-13 17:10:41 |
| d470827dex211.htm | 24553 | 2018-02-13 17:10:41 |
| d470827dex231.htm | 2551 | 2018-02-13 17:10:41 |
| d470827dex311.htm | 10500 | 2018-02-13 17:10:41 |
| d470827dex312.htm | 10517 | 2018-02-13 17:10:41 |
| d470827dex321.htm | 3681 | 2018-02-13 17:10:41 |
| d470827dex322.htm | 4412 | 2018-02-13 17:10:41 |
| FilingSummary.xml | 72780 | 2018-02-13 17:10:41 |
| Financial_Report.xlsx | 151751 | 2018-02-13 17:10:41 |
 g470827g0131220504818.jpg | 4035 | 2018-02-13 17:10:41 |
 g470827g33r23.jpg | 75002 | 2018-02-13 17:10:41 |
 g470827g36e06.jpg | 30230 | 2018-02-13 17:10:41 |
 g470827g75q39.jpg | 171620 | 2018-02-13 17:10:41 |
 g470827g96t89.jpg | 99036 | 2018-02-13 17:10:41 |
| R1.htm | 29994 | 2018-02-13 17:10:41 |
| R10.htm | 128749 | 2018-02-13 17:10:41 |
| R100.htm | 25464 | 2018-02-13 17:10:41 |
| R101.htm | 17261 | 2018-02-13 17:10:41 |
| R102.htm | 81744 | 2018-02-13 17:10:41 |
| R103.htm | 3916 | 2018-02-13 17:10:41 |
| R104.htm | 20035 | 2018-02-13 17:10:41 |
| R11.htm | 8295 | 2018-02-13 17:10:41 |
| R12.htm | 24033 | 2018-02-13 17:10:41 |
| R13.htm | 122677 | 2018-02-13 17:10:41 |
| R14.htm | 21413 | 2018-02-13 17:10:41 |
| R15.htm | 26593 | 2018-02-13 17:10:41 |
| R16.htm | 30654 | 2018-02-13 17:10:41 |
| R17.htm | 79743 | 2018-02-13 17:10:41 |
| R18.htm | 56740 | 2018-02-13 17:10:41 |
| R19.htm | 33025 | 2018-02-13 17:10:41 |
| R2.htm | 56953 | 2018-02-13 17:10:41 |
| R20.htm | 10827 | 2018-02-13 17:10:41 |
| R21.htm | 20796 | 2018-02-13 17:10:41 |
| R22.htm | 45953 | 2018-02-13 17:10:41 |
| R23.htm | 17515 | 2018-02-13 17:10:41 |
| R24.htm | 18092 | 2018-02-13 17:10:41 |
| R25.htm | 9259 | 2018-02-13 17:10:41 |
| R26.htm | 21029 | 2018-02-13 17:10:41 |
| R27.htm | 68317 | 2018-02-13 17:10:41 |
| R28.htm | 125211 | 2018-02-13 17:10:41 |
| R29.htm | 10952 | 2018-02-13 17:10:41 |
| R3.htm | 14934 | 2018-02-13 17:10:41 |
| R30.htm | 128227 | 2018-02-13 17:10:41 |
| R31.htm | 25185 | 2018-02-13 17:10:41 |
| R32.htm | 115580 | 2018-02-13 17:10:41 |
| R33.htm | 19717 | 2018-02-13 17:10:41 |
| R34.htm | 24158 | 2018-02-13 17:10:41 |
| R35.htm | 29245 | 2018-02-13 17:10:41 |
| R36.htm | 78173 | 2018-02-13 17:10:41 |
| R37.htm | 46719 | 2018-02-13 17:10:41 |
| R38.htm | 25941 | 2018-02-13 17:10:41 |
| R39.htm | 15442 | 2018-02-13 17:10:41 |
| R4.htm | 42172 | 2018-02-13 17:10:41 |
| R40.htm | 47879 | 2018-02-13 17:10:41 |
| R41.htm | 18332 | 2018-02-13 17:10:41 |
| R42.htm | 19900 | 2018-02-13 17:10:41 |
| R43.htm | 20594 | 2018-02-13 17:10:41 |
| R44.htm | 12713 | 2018-02-13 17:10:41 |
| R45.htm | 23111 | 2018-02-13 17:10:41 |
| R46.htm | 12717 | 2018-02-13 17:10:41 |
| R47.htm | 33317 | 2018-02-13 17:10:41 |
| R48.htm | 68570 | 2018-02-13 17:10:41 |
| R49.htm | 4200 | 2018-02-13 17:10:41 |
| R5.htm | 22704 | 2018-02-13 17:10:41 |
| R50.htm | 32696 | 2018-02-13 17:10:41 |
| R51.htm | 4204 | 2018-02-13 17:10:41 |
| R52.htm | 12311 | 2018-02-13 17:10:41 |
| R53.htm | 20287 | 2018-02-13 17:10:41 |
| R54.htm | 20960 | 2018-02-13 17:10:41 |
| R55.htm | 19156 | 2018-02-13 17:10:41 |
| R56.htm | 16740 | 2018-02-13 17:10:41 |
| R57.htm | 122167 | 2018-02-13 17:10:41 |
| R58.htm | 61812 | 2018-02-13 17:10:41 |
| R59.htm | 39988 | 2018-02-13 17:10:41 |
| R6.htm | 46122 | 2018-02-13 17:10:41 |
| R60.htm | 72215 | 2018-02-13 17:10:41 |
| R61.htm | 12637 | 2018-02-13 17:10:41 |
| R62.htm | 23332 | 2018-02-13 17:10:41 |
| R63.htm | 8510 | 2018-02-13 17:10:41 |
| R64.htm | 23369 | 2018-02-13 17:10:41 |
| R65.htm | 14909 | 2018-02-13 17:10:41 |
| R66.htm | 32360 | 2018-02-13 17:10:41 |
| R67.htm | 10969 | 2018-02-13 17:10:41 |
| R68.htm | 4096 | 2018-02-13 17:10:41 |
| R69.htm | 20776 | 2018-02-13 17:10:41 |
| R7.htm | 103018 | 2018-02-13 17:10:41 |
| R70.htm | 26113 | 2018-02-13 17:10:41 |
| R71.htm | 35601 | 2018-02-13 17:10:41 |
| R72.htm | 11039 | 2018-02-13 17:10:41 |
| R73.htm | 14662 | 2018-02-13 17:10:41 |
| R74.htm | 18413 | 2018-02-13 17:10:41 |
| R75.htm | 29920 | 2018-02-13 17:10:41 |
| R76.htm | 15295 | 2018-02-13 17:10:41 |
| R77.htm | 17216 | 2018-02-13 17:10:41 |
| R78.htm | 21146 | 2018-02-13 17:10:41 |
| R79.htm | 16186 | 2018-02-13 17:10:41 |
| R8.htm | 8265 | 2018-02-13 17:10:41 |
| R80.htm | 18784 | 2018-02-13 17:10:41 |
| R81.htm | 78921 | 2018-02-13 17:10:41 |
| R82.htm | 13461 | 2018-02-13 17:10:41 |
| R83.htm | 8938 | 2018-02-13 17:10:41 |
| R84.htm | 12968 | 2018-02-13 17:10:41 |
| R85.htm | 7713 | 2018-02-13 17:10:41 |
| R86.htm | 9776 | 2018-02-13 17:10:41 |
| R87.htm | 11800 | 2018-02-13 17:10:41 |
| R88.htm | 30313 | 2018-02-13 17:10:41 |
| R89.htm | 36440 | 2018-02-13 17:10:41 |
| R9.htm | 82963 | 2018-02-13 17:10:41 |
| R90.htm | 6936 | 2018-02-13 17:10:41 |
| R91.htm | 38618 | 2018-02-13 17:10:41 |
| R92.htm | 37015 | 2018-02-13 17:10:41 |
| R93.htm | 23906 | 2018-02-13 17:10:41 |
| R94.htm | 16304 | 2018-02-13 17:10:41 |
| R95.htm | 15152 | 2018-02-13 17:10:41 |
| R96.htm | 8552 | 2018-02-13 17:10:41 |
| R97.htm | 41592 | 2018-02-13 17:10:41 |
| R98.htm | 18225 | 2018-02-13 17:10:41 |
| R99.htm | 148117 | 2018-02-13 17:10:41 |
| report.css | 2768 | 2018-02-13 17:10:41 |
| Show.js | 1411 | 2018-02-13 17:10:41 |