Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-14-192675-index-headers.html | 2014-05-09 16:57:15 | |
| 0001193125-14-192675-index.html | 2014-05-09 16:57:15 | |
| 0001193125-14-192675.txt | 2014-05-09 16:57:15 | |
 0001193125-14-192675-xbrl.zip | 174869 | 2014-05-09 16:57:15 |
| d704111d10q.htm | 1220716 | 2014-05-09 16:57:15 |
| d704111dex111.htm | 8259 | 2014-05-09 16:57:15 |
| d704111dex311.htm | 9677 | 2014-05-09 16:57:15 |
| d704111dex312.htm | 9676 | 2014-05-09 16:57:15 |
| d704111dex321.htm | 3736 | 2014-05-09 16:57:15 |
| d704111dex322.htm | 3736 | 2014-05-09 16:57:15 |
| FilingSummary.xml | 28428 | 2014-05-09 16:57:15 |
| Financial_Report.xls | 1203131 | 2014-05-09 16:57:15 |
| Financial_Report.xlsx | 213170 | 2014-05-09 16:57:15 |
| navg-20140331.xml | 1640471 | 2014-05-09 16:57:15 |
| navg-20140331.xsd | 55682 | 2014-05-09 16:57:15 |
| navg-20140331_cal.xml | 84081 | 2014-05-09 16:57:15 |
| navg-20140331_def.xml | 366471 | 2014-05-09 16:57:15 |
| navg-20140331_lab.xml | 481541 | 2014-05-09 16:57:15 |
| navg-20140331_pre.xml | 423575 | 2014-05-09 16:57:15 |
| R1.htm | 28804 | 2014-05-09 16:57:15 |
| R10.htm | 101563 | 2014-05-09 16:57:15 |
| R11.htm | 39975 | 2014-05-09 16:57:15 |
| R12.htm | 12689 | 2014-05-09 16:57:15 |
| R13.htm | 7683 | 2014-05-09 16:57:15 |
| R14.htm | 11105 | 2014-05-09 16:57:15 |
| R15.htm | 6574 | 2014-05-09 16:57:15 |
| R16.htm | 8705 | 2014-05-09 16:57:15 |
| R17.htm | 282313 | 2014-05-09 16:57:15 |
| R18.htm | 6301 | 2014-05-09 16:57:15 |
| R19.htm | 96049 | 2014-05-09 16:57:15 |
| R2.htm | 114168 | 2014-05-09 16:57:15 |
| R20.htm | 37323 | 2014-05-09 16:57:15 |
| R21.htm | 9035 | 2014-05-09 16:57:15 |
| R22.htm | 303072 | 2014-05-09 16:57:15 |
| R23.htm | 8768 | 2014-05-09 16:57:15 |
| R24.htm | 16282 | 2014-05-09 16:57:15 |
| R25.htm | 97577 | 2014-05-09 16:57:15 |
| R26.htm | 25842 | 2014-05-09 16:57:15 |
| R27.htm | 14039 | 2014-05-09 16:57:15 |
| R28.htm | 124203 | 2014-05-09 16:57:15 |
| R29.htm | 11740 | 2014-05-09 16:57:15 |
| R3.htm | 27072 | 2014-05-09 16:57:15 |
| R30.htm | 32794 | 2014-05-09 16:57:15 |
| R31.htm | 11916 | 2014-05-09 16:57:15 |
| R32.htm | 20282 | 2014-05-09 16:57:15 |
| R33.htm | 38607 | 2014-05-09 16:57:15 |
| R34.htm | 46888 | 2014-05-09 16:57:15 |
| R35.htm | 18666 | 2014-05-09 16:57:15 |
| R36.htm | 46891 | 2014-05-09 16:57:15 |
| R37.htm | 17274 | 2014-05-09 16:57:15 |
| R38.htm | 45255 | 2014-05-09 16:57:15 |
| R39.htm | 21447 | 2014-05-09 16:57:15 |
| R4.htm | 81162 | 2014-05-09 16:57:15 |
| R40.htm | 75770 | 2014-05-09 16:57:15 |
| R41.htm | 22614 | 2014-05-09 16:57:15 |
| R42.htm | 15499 | 2014-05-09 16:57:15 |
| R43.htm | 23976 | 2014-05-09 16:57:15 |
| R44.htm | 14992 | 2014-05-09 16:57:15 |
| R45.htm | 11270 | 2014-05-09 16:57:15 |
| R46.htm | 17149 | 2014-05-09 16:57:15 |
| R47.htm | 39577 | 2014-05-09 16:57:15 |
| R48.htm | 29109 | 2014-05-09 16:57:15 |
| R49.htm | 21730 | 2014-05-09 16:57:15 |
| R5.htm | 38628 | 2014-05-09 16:57:15 |
| R6.htm | 14008 | 2014-05-09 16:57:15 |
| R7.htm | 41473 | 2014-05-09 16:57:15 |
| R8.htm | 114912 | 2014-05-09 16:57:15 |
| R9.htm | 9240 | 2014-05-09 16:57:15 |
| report.css | 2740 | 2014-05-09 16:57:15 |
| Show.js | 1410 | 2014-05-09 16:57:15 |