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Subsequent Event - Additional Information (Detail) - Second A&R Credit Facility - Subsequent Event	Oct. 26, 2018 USD ($)
Subsequent Event [Line Items]
Credit facility, borrowing capacity	$ 150,000,000
Credit Facility additional borrowing amount	$ 100,000,000
Credit facility, maturity	May 09, 2022
Swingline Borrowings
Subsequent Event [Line Items]
Credit facility, borrowing capacity	$ 20,000,000
Letter of Credit
Subsequent Event [Line Items]
Credit facility, borrowing capacity	$ 15,000,000
Federal Funds Rate
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	0.50%
LIBOR
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	2.00%
Minimum
Subsequent Event [Line Items]
Credit Facility, fee for undrawn amounts	0.225%
Consolidated fixed charge coverage ratio	300.00%
Minimum | LIBOR
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	1.25%
Minimum | Base Rate
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	0.25%
Maximum
Subsequent Event [Line Items]
Credit Facility, fee for undrawn amounts	0.40%
Consolidated fixed charge coverage ratio	350.00%
Maximum | LIBOR
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	2.25%
Maximum | Base Rate
Subsequent Event [Line Items]
Credit Facility, interest rate above base rate	1.25%

X

- Definition

Line of credit additional borrowing capacity.

+ References

No definition available.

+ Details

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Namespace Prefix:	ttd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Minimum consolidated fixed charge coverage ratio required to be maintained by the entity under the terms of the credit facility agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ttd_
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Balance Type:	na
Period Type:	duration

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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

X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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X

- Details

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- Details

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- Details

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