Goodwill and Intangible Assets - Activity Related to Goodwill by Business Segment (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Beginning of period	$ 1,642,169
Foreign currency translation adjustment	23,962
End of period	1,666,131
U.S. Networks [Member]
Goodwill [Line Items]
Beginning of period	510,484
End of period	510,484
International Networks [Member]
Goodwill [Line Items]
Beginning of period	1,131,685
Foreign currency translation adjustment	23,962
End of period	$ 1,155,647