Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Jun. 30, 2016
DealerRater
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets weighted average useful life		10 years
Workterra LLC
Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets weighted average useful life		7 years
Aurico Inc.
Finite-Lived Intangible Assets [Line Items]
Other intangible assets acquired			$ 14,100
Acquired intangible assets weighted average useful life		8 years
Operating Segments
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge		$ 15,218
Digital | Operating Segments
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment charge	$ 15,200	15,218
Customer relationships | DealerRater
Finite-Lived Intangible Assets [Line Items]
Other intangible assets acquired	28,300	28,300
Other | DealerRater
Finite-Lived Intangible Assets [Line Items]
Other intangible assets acquired	14,100	14,100
Other | Workterra LLC
Finite-Lived Intangible Assets [Line Items]
Other intangible assets acquired	$ 17,900	$ 17,900