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Acquisitions (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Apr. 01, 2016 | Oct. 01, 2015 | May 01, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Adjustments to deferred acquisition consideration included in share-based compensation | $ 2,020 | $ 2,245 | $ 4,925 | $ 4,914 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Fair Value | $ 65,367,000 |  | $ 65,367,000 |  | $ 69,471,000 |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  | 100.00% |  |  |  |  |
Luntz Global Partners L L C |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  | 40.00% |  |
Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  | $ 654 |  |  |  |  |
Business Combinations, Assets Relinquished by Acquirer |  |  | 428 |  |  |  |  |
Business Combinations, Liabilities Relinquished Previously due to Acquiree |  |  | 33 |  |  |  |  |
Aggregate 2015 Acquisitions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, 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, Acquired During Period |  |  |  |  | $ 43,654 |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  | 6 years 4 months |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  |  |  | $ 9,720 |  |  |
Business Combination, Consideration Transferred |  |  |  |  | 55,279 |  |  |
Aggregate 2015 Acquisitions [Member] | Y Media Labs, LLC [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value |  |  |  |  | 1,999 |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  | 60.00%
Aggregate 2015 Acquisitions [Member] | Unique Influence, LLC [Domain] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  | 100.00% |
Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  |  | 37,467 |  |  |
Business Combination, Consideration Transferred, Liabilities Incurred |  |  |  |  | 163,355 |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  | 149,335 |  |  |
Business Combination, Consideration Transferred |  |  |  |  | 200,822 |  |  |
Noncontrolling Interest [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  | 8,708 |  |  |
Additional Paid-in Capital [Member] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | 23,018 |  |  |  |  |
Additional Paid-in Capital [Member] | Aggregate 2015 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  |  |  | $ 42,780 |  |  |
Contingent payment [Domain] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | $ (299,000) | $ (12,741,000) | 6,028,000 | $ (10,493,000) |  |  |  |
Contingent payment [Domain] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Deferred Stock-based Compensation, Discounted |  |  | 2,393 |  |  |  |  |
Business Combination, Consideration Transferred |  |  | 4,052 |  |  |  |  |
Fixed payments [Member] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | 841 |  |  |  |  |
Noncontrolling Interest Equity [Domain] | Aggregate 2016 Step Up Transactions [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests |  |  | $ 19,174 |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of identifiable intangible assets recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + 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 (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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