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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Goodwill [Line Items] |  |  |
Beginning Balance | $ 720,071 | $ 605,244 |
Acquired goodwill | 35,956 | 113,404 |
Acquisition purchase price adjustments |  | (301) | 7,007
Foreign currency translation | (5,220) | 1,724 |
Discontinued operations | (6,474) |  |
Ending Balance | 744,333 | 720,071 | 605,244
Strategic Marketing Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 483,760 | 389,525 |
Acquired goodwill | 0 | 93,531 |
Acquisition purchase price adjustments |  | (78) |
Foreign currency translation | (2,374) | 782 |
Discontinued operations | (3,981) |  |
Ending Balance | 477,405 | 483,760 |
Performance Marketing Services [Member] |  |  |
Goodwill [Line Items] |  |  |
Beginning Balance | 236,311 | 215,719 |
Acquired goodwill | 35,956 | 19,873 |
Acquisition purchase price adjustments |  | (223) |
Foreign currency translation | (2,846) | 942 |
Discontinued operations | (2,493) |  |
Ending Balance | $ 266,928 | $ 236,311 |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e961-128460 + Details
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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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