Discontinued Operations - Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (10,803)	$ 56,698	$ (233,261)	$ 132,141
Sightline Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, before income taxes				(7,500)
Digital
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	54,874	340,649	647,021	999,929
Cost of revenue and SG&A expenses	60,301	228,152	522,287	708,815
Depreciation	0	9,421	19,569	24,843
Amortization	0	23,385	40,300	68,159
Loss on sale of CareerBuilder	(1,872)	0	342,900	0
Total operating expenses	58,429	260,958	925,056	801,817
Total operating (loss) income	(3,555)	79,691	(278,035)	198,112
Non-operating income (expense)	647	(3,304)	(1,078)	(8,989)
(Loss) income from discontinued operations, before income taxes	(2,908)	76,387	(279,113)	189,123
Provision for income taxes	(7,895)	(19,689)	45,852	(56,982)
(Loss) income from discontinued operations, net of tax	$ (10,803)	$ 56,698	$ (233,261)	$ 132,141