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Acquisitions - Textual (Details) - USD ($)					3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 05, 2017	Apr. 01, 2017	Jul. 01, 2016	Mar. 28, 2012	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Apr. 01, 2016	Oct. 31, 2015	May 31, 2015	May 01, 2015
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Revenue											$ 27,025,000
Share-based Compensation					$ 7,480,000	$ 5,560,000			$ 24,350,000	$ 21,003,000	17,796,000
Gain (Loss) on Disposition of Business								$ (800,000)		(940,000)
Goodwill, Written off Related to Sale of Business Unit								$ 764,000	17,593,000	764,000
Noncontrolling Interest, Decrease from Deconsolidation									10,657,000
Goodwill									0	24,778,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests									$ (9,650,000)
Intangible assets amortization period (years)									7 years
Ownership percentage by parent					100.00%				100.00%
Adjustments to deferred acquisition consideration included in share-based compensation									$ 13,079	10,341	9,359
Stock Issued During Period, Value, Acquisitions										34,219,000
Noncontrolling Interest, Increase from Business Combination									6,960,000	8,936,000	51,488,000
Disposal Group, Including Discontinued Operation, Operating Income (Loss)											(322,000)
Disposal Group, Including Discontinued Operation, Other Expense											752,000
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax											(5,207,000)
Loss from discontinued operations									0	0	(6,281,000)
Doner
Business Acquisition [Line Items]
Variable interest entity, qualitative or quantitative information, ownership percentage		65.00%
Aggregate 2017 Step Up Transactions [Domain]
Business Acquisition [Line Items]
Share-based Compensation									996
Cost of acquired entity, cash paid									3,858
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests									11,965
Business Combination, Contingent Consideration, Liability					$ 7,208				7,208
Business Combination, Acquisition of Less than 100 Percent, Redeemable Noncontrolling Interest, Fair Value									816
Noncontrolling Interest, Period Increase (Decrease)									397
Noncontrolling Interest, Increase from Business Combination									2,315
Aggregate 2017 Dispositions [Domain]
Business Acquisition [Line Items]
Share-based Compensation									2,000
Gain (Loss) on Disposition of Business									(1,732,000)
Goodwill, Written off Related to Sale of Business Unit									17,593
Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Cost of acquired entity, cash paid										1,581
Business Combinations, Assets Relinquished by Acquirer										428
Business Combinations, Liabilities Relinquished Previously due to Acquiree										94
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
Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Pro forma revenue							$ 43,535
Pro forma net income (loss)							4,460
Percentage of voting interests acquired			100.00%
Business Combination, Consideration Transferred			$ 49,837
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			36,698
Goodwill			$ 24,778
Intangible assets amortization period (years)			10 years 9 months
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 5,514
Business Acquisition, Goodwill, Expected Tax Deductible Amount			0
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Intangible Assets			8,074
Business Combination, Contingent Consideration, Liability			$ 15,618				$ 3,055
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
Business Acquisition [Line Items]
Percentage of voting interests acquired													40.00%
Doner
Business Acquisition [Line Items]
Percentage of voting interests acquired		15.00%		70.00%
Variable interest entity, qualitative or quantitative information, ownership percentage				30.00%
Doner | Aggregate 2017 Step Up Transactions [Domain]
Business Acquisition [Line Items]
Percentage of voting interests acquired		85.00%
Noncontrolling Interest Equity [Domain] | Aggregate 2017 Dispositions [Domain]
Business Acquisition [Line Items]
Noncontrolling Interest, Increase from Sale of Parent Equity Interest									6,961
Redeemable Noncontrolling Interest [Member] | Aggregate 2017 Dispositions [Domain]
Business Acquisition [Line Items]
Redeemable Noncontrolling Interest, Increase from Sale of Equity Interest									1,690
Additional Paid-in Capital
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests									2,315,000
Noncontrolling Interest, Increase from Business Combination									(5,654,000)	22,776,000	(42,780,000)
Additional Paid-in Capital | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										22,775
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]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests									(11,965,000)
Noncontrolling Interest, Increase from Business Combination									12,614,000	(13,840,000)	(8,708,000)
Noncontrolling Interest [Member] | Aggregate 2017 Dispositions [Domain]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Deconsolidation									10,657,000
Noncontrolling Interest [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										19,354
Noncontrolling Interest [Member] | Aggregate 2015 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests											8,708
Redeemable Noncontrolling Interest [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										910,000	1,708,000	$ 155,042,000
Noncontrolling Interest, Increase from Business Combination										1,666,000	2,274,000	$ 7,703,000
Redeemable Noncontrolling Interest [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests										1,005
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
Contingent payment [Domain] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred									4,052
Business Combination, Deferred Stock-based Compensation, Discounted										2,393
Fixed payments [Member] | Aggregate 2016 Step Up Transactions [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred										$ 467
Common Class A | Common Stock [Member]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions										1,900,000
Common Class A | Common Stock [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Stock Issued During Period, Shares, Acquisitions	2,450,000		1,900,000
Stock Issued During Period, Value, Acquisitions	$ 20,800		$ 34,219						$ 0	$ 34,219,000	$ 0
Contractual redemption right [Member] | Forsman & Bodenfors AB [Domain]
Business Acquisition [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 2,275
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Consideration															$ 17,000,000

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