| Fund balance | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Balance at beginning of period | en | http://xbrl.ssm.com.my/role/ssm/fs/clbg/lab_rol_ssmt-fs-clbg_2017-12-31/ReportingPeriodStartLabel | http://www.xbrl.org/2003/role/link |
| Balance at end of period | en | http://xbrl.ssm.com.my/role/ssm/fs/clbg/lab_rol_ssmt-fs-clbg_2017-12-31/ReportingPeriodEndLabel | http://www.xbrl.org/2003/role/link |
| Report the value, as at the reporting date, of components of equity (such as funds, contributions, etc.), reported as closing balances during last reporting period. | en | http://xbrl.ssm.com.my/role/ssm/fs/clbg/lab_rol_ssmt-fs-clbg_2017-12-31/ReportingDocumentation | http://www.xbrl.org/2003/role/link |
| Report the value, as at reporting period, balance at the end of the period. | en | http://xbrl.ssm.com.my/role/ssm/fs/clbg/lab_rol_ssmt-fs-clbg_2017-12-31/ReportingDocumentationPeriodEndLabel | http://www.xbrl.org/2003/role/link |
| Report the value, as at the reporting date, of components of equity (such as funds, contributions, etc.), reported as closing balances during last reporting period. | en | http://xbrl.ssm.com.my/role/ssm/fs/clbg/lab_rol_ssmt-fs-clbg_2017-12-31/ReportingDocumentationPeriodStartLabel | http://www.xbrl.org/2003/role/link |