| Kapitalanlagen in Sachanlagen in den Niederlanden [Mitglied] | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Investments in real estate in the Netherlands [member] | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Placements dans des biens immobiliers aux Pays-Bas [membre] | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Beleggingen in onroerend goed in Nederland [member] | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Kapitalanlagen in Sachanlagen in den Niederlanden | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Investments in real estate in the Netherlands | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Placements dans des biens immobiliers aux Pays-Bas | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Beleggingen in onroerend goed in Nederland | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |