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Acquisitions (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May. 01, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Aug. 18, 2014 | Aug. 01, 2014 | Jul. 31, 2014 | Jun. 03, 2014 | Feb. 14, 2014 | Jan. 01, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  | $ 1,548 | $ 1,395 | $ 6,462 | $ 5,680 |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  | 4,615 |  | 7,797 |  |  |  |  |  |  |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  | 1,073 |  | 1,646 |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value |  | $ 71,326,000 |  | 71,326,000 |  | $ 194,951,000 |  |  |  |  |  |  | $ 148,534,000
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions |  |  |  | $ (49,154,000) |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  | 100.00% |  | 100.00% |  |  |  |  |  |  |  |  |
Aggregate 2015 Acquisitions [Member] | Y Media Labs, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price | $ 45,096 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid | 20,000 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Deferred Acquisition Consideration | 25,096 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets | 11,542 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Goodwill Amount | 38,618 |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years 1 month |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value | 1,999 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 60.00% |  |  |  |  |  |  |  |  |  |  |  |
Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  | $ 195,669 |  | $ 195,669 |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  | 37,437 |  |  |  |  |  |  |  |  |
Business Acquisition, Deferred Acquisition Consideration |  | 158,232 |  | 158,232 |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value |  | $ 146,459 |  | 146,459 |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Purchase Price |  |  |  |  |  | 151,202,000 |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  |  | 67,236,000 |  |  |  |  |  |  |
Business Acquisition, Deferred Acquisition Consideration |  |  |  |  |  | 83,966,000 |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets |  |  |  |  |  | 64,733,000 |  |  |  |  |  |  |
Business Acquisition, Purchase Price Allocation, Goodwill Amount |  |  |  |  |  | 146,806,000 |  |  |  |  |  |  |
Nonredeemable Noncontrolling Interest |  |  |  |  |  | 50,552,000 |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value |  |  |  |  |  | 13,327,000 |  |  |  |  |  |  |
Business Acquisition Purchase Price Allocation Intangibles and Goodwill Expected Tax Deductible Amount |  |  |  |  |  | 149,232,000 |  |  |  |  |  |  |
Aggregate 2014 Acquisitions [Member] | Luntz Global Partners L L C |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  | 60.00% |
Aggregate 2014 Acquisitions [Member] | Kingsdale Partners LP |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  | 65.00% |  |
Aggregate 2014 Acquisitions [Member] | Hunter PR LLC [Member] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 65.00% |  |  |  |  |
Aggregate 2014 Acquisitions [Member] | Albion Brand Communications Limited [Member] [Domain] [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 75.00% |  |  |  |  |  |
Aggregate 2014 Acquisitions [Member] | The House Worldwide Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Trapeze Media Limited | Union Advertising Canada LC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Union Advertising Canada LC [Member] | Trapeze Media Limited |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition Gain on sale of ownership percentage |  |  |  |  |  | $ 908,000 |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  | 18.00% |  |  |  |
Minimum [Member] | Aggregate 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Maximum [Member] | Aggregate 2014 Acquisitions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  | 6 years |  |  |  |  |  |  |
Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions |  |  |  | (8,708,000) |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions |  |  |  | 8,708 |  |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions |  |  |  | (40,446,000) |  |  |  |  |  |  |  |  |
Additional Paid-in Capital [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Increase Decrease in Redeemable and Non Redeemable Non Controlling Interest from Step up Transactions |  |  |  | $ 40,446 |  |  |  |  |  |  |  |  |

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