Strategic Actions - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 27, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 27, 2015 USD ($)	Dec. 31, 2015 USD ($)	Sep. 07, 2016 employee
Strategic Actions [Line Items]
Revenue	$ 860,265	$ 757,518	$ 2,453,782	$ 2,245,681
Operating Segments | Digital
Strategic Actions [Line Items]
Revenue	$ 358,579	$ 351,073	$ 1,049,320	$ 1,025,770
Operating Segments | Digital | Cars.com
Strategic Actions [Line Items]
Revenue					$ 597,000
Number of employees | employee						1,275
Operating Segments | Digital | CareerBuilder
Strategic Actions [Line Items]
Revenue					$ 700,000
Number of employees | employee						3,285
Ownership interest (as a percent)						53.00%