| De uitgaande kasstromen met betrekking tot erfpacht met betrekking tot operationele activiteiten. | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Erbpacht (aus operativen Tätigkeiten) | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Ground lease expenses (from operating activities) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Emphytéose (des activités opérationnelles) | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Erfpacht (uit operationele activiteiten) | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Erbpacht | de | http://www.xbrl.org/2009/role/negatedTerseLabel | http://www.xbrl.org/2003/role/link |
| Ground lease expenses | en | http://www.xbrl.org/2009/role/negatedTerseLabel | http://www.xbrl.org/2003/role/link |
| Emphytéose | fr | http://www.xbrl.org/2009/role/negatedTerseLabel | http://www.xbrl.org/2003/role/link |
| Erfpacht | nl | http://www.xbrl.org/2009/role/negatedTerseLabel | http://www.xbrl.org/2003/role/link |
| Erbpacht | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Ground lease expenses | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Emphytéose | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Erfpacht | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |