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Geographic Information - Gross Billings Percentage, Based on Billing Address of Clients or Client Affiliates (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Gross Billings	100.00%	100.00%	100.00%	100.00%
U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Gross Billings	87.00%	86.00%	86.00%	86.00%
International
Revenues From External Customers And Long Lived Assets [Line Items]
Gross Billings	13.00%	14.00%	14.00%	14.00%

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- Definition

Billings, gross.

+ References

No definition available.

+ Details

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Namespace Prefix:	ttd_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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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.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: