| PublishDate | 2017-01 | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Positive_XBRL_Value | Enter a positive XBRL value for increase in contribution rate. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Negative_XBRL_Value | Enter a negative XBRL value for decrease in contribution rate. | http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote |
| Publisher | FASB | http://www.xbrl.org/2003/role/exampleRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/exampleRef |
| Topic | 715 | http://www.xbrl.org/2003/role/exampleRef |
| SubTopic | 80 | http://www.xbrl.org/2003/role/exampleRef |
| Section | 50 | http://www.xbrl.org/2003/role/exampleRef |
| Paragraph | 6 | http://www.xbrl.org/2003/role/exampleRef |
| Subparagraph | (b) | http://www.xbrl.org/2003/role/exampleRef |
| URI | http://asc.fasb.org/extlink&oid=65877416&loc=SL14450673-114947 | http://www.xbrl.org/2003/role/exampleRef |
| Publisher | FASB | http://www.xbrl.org/2003/role/exampleRef |
| Name | Accounting Standards Codification | http://www.xbrl.org/2003/role/exampleRef |
| Topic | 715 | http://www.xbrl.org/2003/role/exampleRef |
| SubTopic | 80 | http://www.xbrl.org/2003/role/exampleRef |
| Section | 50 | http://www.xbrl.org/2003/role/exampleRef |
| Paragraph | 11 | http://www.xbrl.org/2003/role/exampleRef |
| Subparagraph | (b) | http://www.xbrl.org/2003/role/exampleRef |
| URI | http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 | http://www.xbrl.org/2003/role/exampleRef |