Acquisitions - Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jul. 22, 2015	Apr. 01, 2015	Dec. 31, 2014	Jun. 16, 2014	Jan. 01, 2014
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 586,342			$ 106,261
Midroll Media
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash		$ 632
Accounts receivable		2,925
Intangible assets		10,700
Goodwill		43,176
Other long-term assets		518
Total assets acquired		57,951
Current liabilities		3,365
Net purchase price		$ 54,586
Journal Communications, Inc.
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash			$ 2,530
Accounts receivable			47,977
Other assets			2,236
Property, plant and equipment			123,264
Intangible assets			295,000
Goodwill			459,405
Other long-term assets			6,351
Assets held for sale			14,500
Total assets acquired			951,263
Accounts payable and accrued liabilities			43,262
Employee benefit obligations			85,261
Long-term deferred liability			55,054
Long-term debt			126,873
Other long-term liabilities			4,813
Net purchase price			$ 636,000
Detroit MyNetworkTV affiliate and Buffalo ABC affiliate
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Property, plant and equipment					$ 12,025
Intangible assets					53,500
Goodwill					44,715
Total assets acquired					110,240
Current liabilities					240
Net purchase price					$ 110,000
Media Convergence Group (Newsy)
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable						$ 640
Other assets						74
Property, plant and equipment						631
Intangible assets						5,900
Goodwill						28,983
Total assets acquired						36,228
Current liabilities						116
Long-term deferred liability						890
Net purchase price						$ 35,222