SIGNIFICANT CLIENTS (NARRATIVE) (DETAILS) (Client A [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Client A [Member]
Entity Wide Revenue Major Customer Line Items
Revenue from major customer as a percentage of total revenue	11.80%	9.80%	11.80%	9.60%
Accounts receivable amount from major customer	$ 32.5	$ 26.7	$ 32.5	$ 26.7

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.

No definition available.

Name:	ttec_EntityWideAccountsReceivableMajorCustomerAmount
Namespace Prefix:	ttec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant