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DERIVATIVES (NOTIONAL TABLE) (Details) ₱ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Sep. 30, 2020 CAD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 PHP (₱)	Sep. 30, 2020 MXN ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 PHP (₱)	Dec. 31, 2019 MXN ($)
Derivative [Line Items]
Notional Amount		$ 32,800			$ 64,500
CAD
Derivative [Line Items]
Contract Maturity Date	Jul. 01, 2021
PHP
Derivative [Line Items]
Contract Maturity Date	Jul. 01, 2023
MXN
Derivative [Line Items]
Contract Maturity Date	Jul. 01, 2023
Foreign Exchange Forward
Derivative [Line Items]
Notional Amount		178,974			209,183
Foreign Exchange Forward | CAD
Derivative [Line Items]
Notional Amount	$ 3,500	$ 2,646
% Maturing in the Next 12 Months	100.00%	100.00%	100.00%	100.00%
Foreign Exchange Forward | PHP
Derivative [Line Items]
Notional Amount		$ 125,887	₱ 6,565,000		147,654	₱ 7,715,000
% Maturing in the Next 12 Months	56.80%	56.80%	56.80%	56.80%
Foreign Exchange Forward | MXN
Derivative [Line Items]
Notional Amount		$ 50,441		$ 1,115,500	$ 61,529		$ 1,299,500
% Maturing in the Next 12 Months	53.00%	53.00%	53.00%	53.00%

X

- Definition

The percentage of the foreign currency cash flow hedge derivative contract maturing in the next twelve months.

+ References

No definition available.

+ Details

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Namespace Prefix:	ttec_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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X

- Details

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X

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X

- Details

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X

- Details

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