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Earnings Per Share - Additional Information (Detail)	Jun. 30, 2020 Class
Earnings Per Share
Number of classes of common stock	2

X

- Definition

The number of classes of common stock of the entity.

+ References

No definition available.

+ Details

Name:	ttd_CommonStockNumberOfClasses
Namespace Prefix:	ttd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration