| elementCreationTaxonomyVersion | 2008 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| SourceName | Taxonomy Technical Improvement | http://fasb.org/srt/role/changeNote/changeNote |
| TaxonomyVersion | 2019 | http://fasb.org/srt/role/changeNote/changeNote |
| ChangeDate | 2018-09 | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedLabels | true | http://fasb.org/srt/role/changeNote/changeNote |
| ModifiedDocumentation | true | http://fasb.org/srt/role/changeNote/changeNote |
| PreviousDocumentation | This element represents revenue received, but not recognized for financial reporting purposes. Such deferred revenue may consist of and include amounts paid in advance by lessees. | http://fasb.org/srt/role/changeNote/changeNote |
| Publisher | FASB | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Name | Accounting Standards Codification | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Topic | 840 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| SubTopic | 30 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Section | 50 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Paragraph | 4 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| Subparagraph | (a)(4) | http://fasb.org/us-gaap/role/ref/otherTransitionRef |
| URI | http://asc.fasb.org/extlink&oid=123392090&loc=d3e45377-112738 | http://fasb.org/us-gaap/role/ref/otherTransitionRef |