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Acquisitions - Textual (Details) - USD ($) |  | 12 Months Ended |  |  |  |  |  |  |  |
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Mar. 28, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2015 | May. 01, 2015 | Aug. 18, 2014 | Aug. 01, 2014 | Jul. 31, 2014 | Jun. 03, 2014 | Feb. 14, 2014 | Jan. 01, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Pro forma revenue |  | $ 13,703,000 |  |  |  |  |  |  |  |  |  |
Pro forma net income (loss) |  | $ (10,922,000) |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  |  |  |  |  |  |  |  |  |
Adjustments to deferred acquisition consideration included in share-based compensation |  | $ 9,357 | $ 7,802 | $ 6,240 |  |  |  |  |  |  |  |
Aggregate 2015 Acquisitions [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 55,279 |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  | 23,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | 32,279 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 16,721 |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 43,654 |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  | 6 years 4 months |  |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  | $ 9,720 |  |  |  |  |  |  |  |  |  |
Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  | 200,822 |  |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  | 37,467 |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  | 163,355 |  |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | 151,202,000 |  |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  | 67,236,000 |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  | 83,966,000 |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | 64,733,000 |  |  |  |  |  |  |  |  |
Goodwill |  |  | 146,806,000 |  |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | $ 149,232,000 |  |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  |  | 5 years | 5 years |  |  |  |  |  |  |  |
Aggregate 2014 Acquisitions | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets amortization period (years) |  |  | 6 years | 6 years |  |  |  |  |  |  |  |
Trapeze Media Limited | Union Advertising Canada LC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Step acquisition gain on sale of ownership percentage |  |  | $ 908,000 |  |  |  |  |  |  |  |  |
Aggregate 2013 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  | $ 35,591,000 |  |  |  |  |  |  |  |
Cost of acquired entity, cash paid |  |  |  | 12,000,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  | 23,591,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | 10,961,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  | 32,786,000 |  |  |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  | $ 43,747,000 |  |  |  |  |  |  |  |
Y Media Labs LLC [Domain] | Aggregate 2015 Acquisitions [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  | 60.00% |  |  |  |  |  |
Unique Influence LLC [Domain] | Aggregate 2015 Acquisitions [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Net Assets Acquired |  |  |  |  | 100.00% |  |  |  |  |  |  |
Luntz Global Partners LLC | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  |  | 60.00%
Kingsdale Partners, LP | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  |  | 65.00% |
The House Worldwide Ltd | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  |  |  | 100.00% |  |
Hunter PR LLC | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  |  | 65.00% |  |  |  |
Albion Brand Communications Limited | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  |  |  |  | 75.00% |  |  |  |  |
Trapeze Media Limited |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  |  |  | 18.00% |  |  |
Local Biz Now | Aggregate 2013 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired |  |  |  | 70.00% |  |  |  |  |  |  |  |
Doner |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, qualitative or quantitative information, ownership percentage | 30.00% |  |  |  |  |  |  |  |  |  |  |
Doner | Aggregate 2012 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 70.00% |  |  |  |  |  |  |  |  |  |  |
Additional Paid-in Capital | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 42,780 |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 8,708 |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Member] | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  | 50,552,000 |  |  |  |  |  |  |  |  |
Noncontrolling Interest [Member] | Aggregate 2013 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  | $ 10,657,000 |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | 155,042,000 | 4,820,000 | $ 4,270,000 |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Member] | Aggregate 2015 Acquisitions [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  | 1,999 |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  | $ 149,335 |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Member] | Aggregate 2014 Acquisitions |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  | $ 13,327,000 |  |  |  |  |  |  |  |  |

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