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Non-controlling Interests - Summary of Ownership of the LLC Units (Details)	3 Months Ended
	Mar. 31, 2025 shares
Noncontrolling Interest [Line Items]
Ownership, Balances as of December 31, 2024	236,510,211
Ownership, Vesting of LLC Units	62,504
Ownership, Issuance of LLC Units in connection with equity-based compensation plans	1,819,189
Ownership, Balances as of March 31, 2025	238,391,904
Ownership Percentage, Balances as of December 31, 2024	100.00%
Ownership Percentage, Balances as of March 31, 2025	100.00%
OneStream, Inc.
Noncontrolling Interest [Line Items]
Ownership, Balances as of December 31, 2024	173,652,398
Ownership, Exchange of Class C common stock	598,404
Ownership, Issuance of LLC Units in connection with equity-based compensation plans	1,819,189
Ownership, Balances as of March 31, 2025	176,069,991
Ownership Percentage, Balances as of December 31, 2024	73.40%
Ownership Percentage, Exchange of Class C common stock	0.30%
Ownership Percentage, Issuance of LLC Units in connection with equity-based compensation plans	0.20%
Ownership Percentage, Balances as of March 31, 2025	73.90%
Continuing Members
Noncontrolling Interest [Line Items]
Ownership, Balances as of December 31, 2024	62,857,813	[1]
Ownership, Exchange of Class C common stock	(598,404)	[1]
Ownership, Vesting of LLC Units	62,504	[1]
Ownership, Balances as of March 31, 2025	62,321,913	[1]
Ownership Percentage, Balances as of December 31, 2024	26.60%	[1]
Ownership Percentage, Exchange of Class C common stock	(0.30%)	[1]
Ownership Percentage, Issuance of LLC Units in connection with equity-based compensation plans	(0.20%)	[1]
Ownership Percentage, Balances as of March 31, 2025	26.10%	[1]
[1] Excludes 1,009,302 and 1,071,806 LLC Units still subject to vesting conditions at March 31, 2025 and December 31, 2024, respectively.

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- Definition

Minority interest ownership percentage.

+ References

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- Definition

Ownership percentage, issuance of limited liability company units in connection with equity-based compensation plans.

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- Definition

Ownership percentage of exchange of common stock to units.

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- Definition

Vesting of common units.

+ References

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- Definition

Number of common units of ownership outstanding of a limited liability company (LLC).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The number of units converted into shares of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-5

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-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
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Number of units issued for unit-based payment arrangement issued by partnership. Partner includes, but is not limited to, general, limited and preferred partners.

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-Topic 505
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