| De nadere informatie over onderhanden projecten opgenomen onder passiva. | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Offenlegung von laufenden Projekten (Passiva) | de | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Disclosure of construction contracts (liabilities) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Informations à fournir sur les projets en cours (passifs) | fr | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Informatieverschaffing over onderhanden projecten (passiva) | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Offenlegung von laufenden Projekten | de | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Disclosure of construction contracts | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Informations à fournir sur les projets en cours | fr | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Informatieverschaffing over onderhanden projecten | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |