Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000757011-13-000023-index-headers.html | 2013-02-15 15:48:01 | |
| 0000757011-13-000023-index.html | 2013-02-15 15:48:01 | |
| 0000757011-13-000023.txt | 2013-02-15 15:48:01 | |
 0000757011-13-000023-xbrl.zip | 458545 | 2013-02-15 15:48:01 |
| FilingSummary.xml | 51299 | 2013-02-15 15:48:01 |
| Financial_Report.xls | 3693517 | 2013-02-15 15:48:01 |
| R1.htm | 37212 | 2013-02-15 15:48:01 |
| R10.htm | 6460 | 2013-02-15 15:48:01 |
| R100.htm | 60333 | 2013-02-15 15:48:01 |
| R101.htm | 27201 | 2013-02-15 15:48:01 |
| R102.htm | 121231 | 2013-02-15 15:48:01 |
| R103.htm | 76588 | 2013-02-15 15:48:01 |
| R104.htm | 8801 | 2013-02-15 15:48:01 |
| R105.htm | 15136 | 2013-02-15 15:48:01 |
| R106.htm | 26374 | 2013-02-15 15:48:01 |
| R107.htm | 14125 | 2013-02-15 15:48:01 |
| R108.htm | 27026 | 2013-02-15 15:48:01 |
| R109.htm | 7555 | 2013-02-15 15:48:01 |
| R11.htm | 32352 | 2013-02-15 15:48:01 |
| R110.htm | 22001 | 2013-02-15 15:48:01 |
| R111.htm | 47199 | 2013-02-15 15:48:01 |
| R112.htm | 8775 | 2013-02-15 15:48:01 |
| R113.htm | 18127 | 2013-02-15 15:48:01 |
| R12.htm | 45870 | 2013-02-15 15:48:01 |
| R13.htm | 71185 | 2013-02-15 15:48:01 |
| R14.htm | 72564 | 2013-02-15 15:48:01 |
| R15.htm | 132532 | 2013-02-15 15:48:01 |
| R16.htm | 88431 | 2013-02-15 15:48:01 |
| R17.htm | 429626 | 2013-02-15 15:48:01 |
| R18.htm | 106223 | 2013-02-15 15:48:01 |
| R19.htm | 98976 | 2013-02-15 15:48:01 |
| R2.htm | 123774 | 2013-02-15 15:48:01 |
| R20.htm | 121880 | 2013-02-15 15:48:01 |
| R21.htm | 146978 | 2013-02-15 15:48:01 |
| R22.htm | 149199 | 2013-02-15 15:48:01 |
| R23.htm | 57502 | 2013-02-15 15:48:01 |
| R24.htm | 11156 | 2013-02-15 15:48:01 |
| R25.htm | 8523 | 2013-02-15 15:48:01 |
| R26.htm | 17948 | 2013-02-15 15:48:01 |
| R27.htm | 16474 | 2013-02-15 15:48:01 |
| R28.htm | 81857 | 2013-02-15 15:48:01 |
| R29.htm | 44091 | 2013-02-15 15:48:01 |
| R3.htm | 64398 | 2013-02-15 15:48:01 |
| R30.htm | 128360 | 2013-02-15 15:48:01 |
| R31.htm | 28322 | 2013-02-15 15:48:01 |
| R32.htm | 48304 | 2013-02-15 15:48:01 |
| R33.htm | 73421 | 2013-02-15 15:48:01 |
| R34.htm | 38724 | 2013-02-15 15:48:01 |
| R35.htm | 121001 | 2013-02-15 15:48:01 |
| R36.htm | 75360 | 2013-02-15 15:48:01 |
| R37.htm | 409759 | 2013-02-15 15:48:01 |
| R38.htm | 90558 | 2013-02-15 15:48:01 |
| R39.htm | 108085 | 2013-02-15 15:48:01 |
| R4.htm | 43705 | 2013-02-15 15:48:01 |
| R40.htm | 118905 | 2013-02-15 15:48:01 |
| R41.htm | 129971 | 2013-02-15 15:48:01 |
| R42.htm | 137157 | 2013-02-15 15:48:01 |
| R43.htm | 56997 | 2013-02-15 15:48:01 |
| R44.htm | 15123 | 2013-02-15 15:48:01 |
| R45.htm | 74966 | 2013-02-15 15:48:01 |
| R46.htm | 41743 | 2013-02-15 15:48:01 |
| R47.htm | 16073 | 2013-02-15 15:48:01 |
| R48.htm | 9349 | 2013-02-15 15:48:01 |
| R49.htm | 17817 | 2013-02-15 15:48:01 |
| R5.htm | 161724 | 2013-02-15 15:48:01 |
| R50.htm | 30938 | 2013-02-15 15:48:01 |
| R51.htm | 14354 | 2013-02-15 15:48:01 |
| R52.htm | 16838 | 2013-02-15 15:48:01 |
| R53.htm | 16317 | 2013-02-15 15:48:01 |
| R54.htm | 24517 | 2013-02-15 15:48:01 |
| R55.htm | 15770 | 2013-02-15 15:48:01 |
| R56.htm | 16277 | 2013-02-15 15:48:01 |
| R57.htm | 14125 | 2013-02-15 15:48:01 |
| R58.htm | 7014 | 2013-02-15 15:48:01 |
| R59.htm | 35463 | 2013-02-15 15:48:01 |
| R6.htm | 25561 | 2013-02-15 15:48:01 |
| R60.htm | 22063 | 2013-02-15 15:48:01 |
| R61.htm | 144171 | 2013-02-15 15:48:01 |
| R62.htm | 53124 | 2013-02-15 15:48:01 |
| R63.htm | 26565 | 2013-02-15 15:48:01 |
| R64.htm | 20236 | 2013-02-15 15:48:01 |
| R65.htm | 46521 | 2013-02-15 15:48:01 |
| R66.htm | 45280 | 2013-02-15 15:48:01 |
| R67.htm | 25541 | 2013-02-15 15:48:01 |
| R68.htm | 30732 | 2013-02-15 15:48:01 |
| R69.htm | 17687 | 2013-02-15 15:48:01 |
| R7.htm | 190160 | 2013-02-15 15:48:01 |
| R70.htm | 118225 | 2013-02-15 15:48:01 |
| R71.htm | 22981 | 2013-02-15 15:48:01 |
| R72.htm | 15353 | 2013-02-15 15:48:01 |
| R73.htm | 32267 | 2013-02-15 15:48:01 |
| R74.htm | 90724 | 2013-02-15 15:48:01 |
| R75.htm | 37842 | 2013-02-15 15:48:01 |
| R76.htm | 21264 | 2013-02-15 15:48:01 |
| R77.htm | 125557 | 2013-02-15 15:48:01 |
| R78.htm | 17625 | 2013-02-15 15:48:01 |
| R79.htm | 74610 | 2013-02-15 15:48:01 |
| R8.htm | 65449 | 2013-02-15 15:48:01 |
| R80.htm | 35093 | 2013-02-15 15:48:01 |
| R81.htm | 17641 | 2013-02-15 15:48:01 |
| R82.htm | 35834 | 2013-02-15 15:48:01 |
| R83.htm | 103555 | 2013-02-15 15:48:01 |
| R84.htm | 13112 | 2013-02-15 15:48:01 |
| R85.htm | 26308 | 2013-02-15 15:48:01 |
| R86.htm | 36922 | 2013-02-15 15:48:01 |
| R87.htm | 41663 | 2013-02-15 15:48:01 |
| R88.htm | 26238 | 2013-02-15 15:48:01 |
| R89.htm | 9890 | 2013-02-15 15:48:01 |
| R9.htm | 35832 | 2013-02-15 15:48:01 |
| R90.htm | 35101 | 2013-02-15 15:48:01 |
| R91.htm | 28090 | 2013-02-15 15:48:01 |
| R92.htm | 63098 | 2013-02-15 15:48:01 |
| R93.htm | 64531 | 2013-02-15 15:48:01 |
| R94.htm | 27451 | 2013-02-15 15:48:01 |
| R95.htm | 12591 | 2013-02-15 15:48:01 |
| R96.htm | 5279 | 2013-02-15 15:48:01 |
| R97.htm | 12479 | 2013-02-15 15:48:01 |
| R98.htm | 46410 | 2013-02-15 15:48:01 |
| R99.htm | 36004 | 2013-02-15 15:48:01 |
| report.css | 2721 | 2013-02-15 15:48:01 |
| Show.js | 6423 | 2013-02-15 15:48:01 |
| usg-12312012x10k.htm | 3309279 | 2013-02-15 15:48:01 |
| usg-20121231.xml | 4381247 | 2013-02-15 15:48:01 |
| usg-20121231.xsd | 98298 | 2013-02-15 15:48:01 |
| usg-20121231_cal.xml | 144972 | 2013-02-15 15:48:01 |
| usg-20121231_def.xml | 618230 | 2013-02-15 15:48:01 |
| usg-20121231_lab.xml | 1509970 | 2013-02-15 15:48:01 |
| usg-20121231_pre.xml | 914366 | 2013-02-15 15:48:01 |
| usg-ex951231201210k.htm | 18994 | 2013-02-15 15:48:01 |
 usg10kperformance2012.jpg | 28046 | 2013-02-15 15:48:01 |
| usg_ex10231231201210k.htm | 45238 | 2013-02-15 15:48:01 |
| usg_ex10401231201210k.htm | 146381 | 2013-02-15 15:48:01 |
| usg_ex10411231201210k.htm | 88312 | 2013-02-15 15:48:01 |
| usg_ex211231201210k.htm | 11650 | 2013-02-15 15:48:01 |
| usg_ex231231201210k.htm | 2816 | 2013-02-15 15:48:01 |
| usg_ex241231201210k.htm | 20519 | 2013-02-15 15:48:01 |
| usg_ex3111231201210k.htm | 11902 | 2013-02-15 15:48:01 |
| usg_ex3121231201210k.htm | 11844 | 2013-02-15 15:48:01 |
| usg_ex3211231201210k.htm | 4999 | 2013-02-15 15:48:01 |
| usg_ex3221231201210k.htm | 4989 | 2013-02-15 15:48:01 |