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Acquisitions (Details Textual) (USD $)
In Thousands, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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Dec. 31, 2013
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Jan. 01, 2014
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Feb. 14, 2014
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Aug. 01, 2014
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Aug. 18, 2014
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Jun. 03, 2014
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Jul. 31, 2014
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| Business Acquisition [Line Items] |
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| Business Acquisition, Increase (Decrease) In Contingent Purchase Price Obligation |
$ 2,248 |
$ 8,022 |
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| Redeemable Noncontrolling Interest, Equity, Fair Value |
202,338 |
194,951 |
194,951 |
148,534 |
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| Noncontrolling Interest, Ownership Percentage by Parent |
100.00% |
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| Aggregate 2014 Acquisitions [Member] |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Cost of Acquired Entity, Purchase Price |
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151,202 |
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| Business Acquisition, Cost of Acquired Entity, Cash Paid |
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67,236 |
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| Business Acquisition, Deferred Acquisition Consideration |
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83,966 |
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| Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets |
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61,906 |
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| Business Acquisition, Purchase Price Allocation, Goodwill Amount |
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149,234 |
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| Nonredeemable Noncontrolling Interest |
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50,552 |
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| Redeemable Noncontrolling Interest, Equity, Fair Value |
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13,327 |
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| Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount |
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149,232 |
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| Aggregate 2014 Acquisitions [Member] | Luntz Global Partners L L C |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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60.00% |
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| Aggregate 2014 Acquisitions [Member] | Kingsdale Partners LP |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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65.00% |
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| Aggregate 2014 Acquisitions [Member] | Hunter PR LLC [Member] [Domain] |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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65.00% |
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| Aggregate 2014 Acquisitions [Member] | Albion Brand Communications Limited [Member] [Domain] [Domain] |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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75.00% |
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| Aggregate 2014 Acquisitions [Member] | The House Worldwide Ltd [Member] |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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100.00% |
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| Trapeze Media Limited | Union Advertising Canada LC [Member] |
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| Business Acquisition [Line Items] |
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| Business Acquisition, Percentage of Voting Interests Acquired |
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100.00% |
| Union Advertising Canada LC [Member] | Trapeze Media Limited |
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| Business Acquisition [Line Items] |
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| Business Combination, Step Acquisition Gain on sale of ownership percentage |
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$ 908 |
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| Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |
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18.00% |
| Minimum [Member] | Aggregate 2014 Acquisitions [Member] |
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| Business Acquisition [Line Items] |
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| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |
5 years |
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| Maximum [Member] | Aggregate 2014 Acquisitions [Member] |
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| Business Acquisition [Line Items] |
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| Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |
6 years |
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