| Component: (Network and Table) | |
|---|---|
| Network | 100390 - Disclosure - Significant Accounting Policies - Schedule of Estimated Useful Lives of Finite-Lived Intangible Assets (Details) (http://www.blackline.com/20161231/taxonomy/role/DisclosureSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesOfFiniteLivedIntangibleAssetsDetails) |
| Table | Schedule Of Finite Lived Intangible Assets [Table] |
| Reporting Entity [Axis] | 0001666134 (http://www.sec.gov/CIK) |
| Finite Lived Intangible Assets [Line Items] | Period [Axis] | |||||||
|---|---|---|---|---|---|---|---|---|
2016-01-01 - 2016-12-31 | ||||||||
| Finite-Lived Intangible Assets by Major Class | ||||||||
| Trade name | Developed technology | Non-compete agreements | Customer relationships | |||||
| Range | Range | Range | Range | |||||
| Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | Minimum | Maximum | |
Finite-lived intangible asset, useful life | ||||||||