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Goodwill and Intangible Assets - Textual (Details)	3 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($) reportable_segment	Sep. 30, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Goodwill [Line Items]
Goodwill, impaired, accumulated impairment loss				$ 98,645,000
Goodwill, Impairment Loss			$ 764,000	$ 17,593,000	$ 764,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				7 years
Amortization of intangibles				$ 19,601,000	24,153,000	$ 33,352,000
Goodwill, Impairment Loss				3,238,000	48,524,000
Indefinite-lived Intangible Assets [Member]
Goodwill [Line Items]
Amortization of intangibles				$ 17,125,000	21,726,000	$ 30,024,000
Customer Relationships
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				6 years
Other Intangible Assets
Goodwill [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				9 years
All Other [Domain]
Goodwill [Line Items]
Goodwill, Impairment Loss				$ 0	764,000
Goodwill, Impairment Loss				$ 3,238,000	$ 29,631,000
Reporting Units Impaired, Annual Goodwill Impairment Test				2
Experiential [Member] | All Other [Domain]
Goodwill [Line Items]
Reporting Units, Goodwill Impairment Test Performed During Interim Period | reportable_segment		1
Goodwill, Impairment Loss		$ 27,893,000
Immaterial [Member] | All Other [Domain]
Goodwill [Line Items]
Reporting Units, Goodwill Impairment Test Performed During Interim Period | reportable_segment		1
Goodwill, Impairment Loss		$ 1,738,000
Strategic Communications [Member]
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 18,893,000
Reporting Units Impaired, Annual Goodwill Impairment Test					1

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
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