Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
May. 31, 2015 |
May. 31, 2014 |
|
| Statement of Comprehensive Income [Abstract] | ||||
| Tax provision (benefit) included in accumulated unrealized gains on investments | $ 0 | $ (28) | $ 0 | $ (159) |