Tax Receivable Agreement and Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Subsidiary, Sale of Stock [Line Items]
Percentage of net cash saving to be paid	85.00%
Percentage of net cash saving to be retained	15.00%
Total TRA liability recognized	$ 100,000		$ 100,000
Outside basis difference in partnership	0		0
Aggregate payment on tax receivable agreement	0	$ 0
Uncertain tax positions	0		0
Penalties and interest related to uncertain tax positions	$ 0		$ 0
Class A Common Stock \| Direct Digital Management LLC
Subsidiary, Sale of Stock [Line Items]
Conversion of stock, shares converted	0	318

Amount of aggregate payment on tax receivable agreement during the period.

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- Definition

Liability Related To Tax Receivable Agreement, Including Rounding Difference

+ References

No definition available.

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- Definition

The amount of outside basis difference in partnership.

+ References

No definition available.

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- Definition

Represents the percentage of net cash savings to be paid under Tax Receivable Agreement.

+ References

No definition available.

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- Definition

Represents the percentage of net cash savings to be retained under Tax Receivable Agreement.

+ References

No definition available.

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- Definition

The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

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- Definition

Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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