Acquisitions - Narrative (Details) $ in Thousands, set_up_box in Millions, professional in Millions						1 Months Ended	3 Months Ended			12 Months Ended
	Oct. 01, 2014 USD ($) television_channel	Aug. 29, 2014 USD ($) project professional	Jul. 04, 2014 USD ($) television_channel set_up_box country	May 01, 2014 USD ($)	Jan. 31, 2014 USD ($)	May 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 29, 2013 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 28, 2014 USD ($)
Business Acquisition [Line Items]
Net cash										$ 0	$ 74,959	$ 279,833
Infostrada, SportsDirect, Covers, Enswers
Business Acquisition [Line Items]
Net cash						$ 69,849
Transaction costs incurred						$ 3,000
Definite-lived intangible assets useful life, years						12 years
Infostrada, SportsDirect, Covers, Enswers | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years						11 years
Infostrada, SportsDirect, Covers, Enswers | Content database
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years						14 years
Infostrada, SportsDirect, Covers, Enswers | Technologies
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years						8 years
Infostrada, SportsDirect, Covers, Enswers | Trade names and trademarks
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years						15 years
Infostrada, SportsDirect, Covers, Enswers | Noncompete Agreements
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years						5 years
HWW
Business Acquisition [Line Items]
Net cash	$ 18,249
Transaction costs incurred	$ 1,000
Definite-lived intangible assets useful life, years	8 years
Number of national and local TV channels in Australia acquired | television_channel	500
HWW | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years	12 years
HWW | Content database
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years	5 years
HWW | Technologies
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years	7 years
Baseline, LLC
Business Acquisition [Line Items]
Net cash		$ 48,788
Transaction costs incurred		$ 1,000
Definite-lived intangible assets useful life, years		11 years
Movie and TV project information acquired | project		300,000
Number of TV and film professionals information acquired | professional		1.5
Period of deductible purchase price		15 years
Baseline, LLC | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years		6 years
Baseline, LLC | Content database
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years		15 years
Baseline, LLC | Technologies
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years		7 years
Baseline, LLC | Trade names and trademarks
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years		5 years
What's On India Media Private Limited
Business Acquisition [Line Items]
Net cash			$ 21,000
Transaction costs incurred			$ 1,000
Definite-lived intangible assets useful life, years			10 years
Total purchase price for acquisition			$ 26,825
NPV of deferred payments			5,625
Possible additional payments to selling management shareholders			$ 8,000
Business Combination, Consideration Transferred, Additional Payment Made							$ 4,000	$ 4,000
Number of countries offered EPG data and TV search products | country			16
Number of television channels | television_channel			1,600
Number of set-top boxes | set_up_box			58
What's On India Media Private Limited | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years			7 years
What's On India Media Private Limited | Content database
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years			13 years
What's On India Media Private Limited | Technologies
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years			7 years
What's On India Media Private Limited | Trade names and trademarks
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years			3 years
What's On India Media Private Limited | Noncompete Agreements
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years			5 years
Gracenote, Inc.
Business Acquisition [Line Items]
Net cash					$ 157,814
Transaction costs incurred					$ 4,000				$ 1,000
Definite-lived intangible assets useful life, years					11 years
Gracenote, Inc. | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years					10 years
Gracenote, Inc. | Content database
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years					13 years
Gracenote, Inc. | Technologies
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years					8 years
Gracenote, Inc. | Trade names and trademarks
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years					15 years
Landmark Acquisition Distributed in Spin-off
Business Acquisition [Line Items]
Net cash				$ 28,981
Definite-lived intangible assets useful life, years				15 years
Period of deductible purchase price				15 years
Transaction costs reflected in discontinued operations												$ 400
Landmark Acquisition Distributed in Spin-off | Customer relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years				7 years
Landmark Acquisition Distributed in Spin-off | Trade names and trademarks
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years				20 years
Landmark Acquisition Distributed in Spin-off | Advertiser Relationships
Business Acquisition [Line Items]
Definite-lived intangible assets useful life, years				12 years