XML 88 R74.htm IDEA: XBRL DOCUMENT v3.8.0.1

Gross Billings, Based on Billing Address of Clients or Client Affiliates (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross Billings	$ 1,491,742	$ 990,561	$ 529,975
UNITED STATES
Segment Reporting Information [Line Items]
Gross Billings	1,270,116	868,877	477,585
International
Segment Reporting Information [Line Items]
Gross Billings	$ 221,626	$ 121,684	$ 52,390

X

- Definition

Billings, gross.

+ References

No definition available.

+ Details

Name:	ttd_BillingsGross
Namespace Prefix:	ttd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- 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

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

X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: