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SIGNIFICANT CLIENTS (NARRATIVE) (DETAILS) (Client A [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Client A [Member] |  |  |  |
Entity Wide Revenue Major Customer Line Items |  |  |  |
Revenue from major customer as a percentage of total revenue | 11.50% | 9.80% | 11.70% | 9.70%
Accounts receivable amount from major customer | $ 29.3 | $ 25.8 | $ 29.3 | $ 25.8

X
- Definition Amount of accounts receivable balance from revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | ttec_EntityWideAccountsReceivableMajorCustomerAmount
Namespace Prefix: | ttec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_EntityWideRevenueMajorCustomerLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration