| Amount, before tax, of net income (loss) derived from real estate held for development and sale, and related investments. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Real Estate Partnership Investment Subsidiaries, Net Income (Loss) before Tax | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Real Estate Partnership Investment Subsidiaries, Net Income (Loss) before Tax, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |