| Description of material leasing arrangements by lessor classified as finance lease | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Concept not required as it has an expiry date of 01-01-2019 | en | http://www.xbrl.org/2009/role/deprecatedLabel | http://www.xbrl.org/2003/role/link |
| 2019-01-01 | en | http://www.xbrl.org/2009/role/deprecatedDateLabel | http://www.xbrl.org/2003/role/link |
| The general description of the lessor’s material leasing arrangements related to finance leases. | en | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |