Employee Termination Program - Summary of Rollforward of the Liability Related to the Reorganization Charges by Segment (Details) - Reorganization [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Restructuring Cost And Reserve [Line Items]
Liability, beginning balance		$ 3,540	$ 3,266
Net accruals		(103)	7,281
Payments		(3,437)	(4,438)
Non-cash	[1]		(1,441)
Liability, ending balance			4,668
U.S. Networks [Member]
Restructuring Cost And Reserve [Line Items]
Liability, beginning balance		1,955	3,258
Net accruals		(142)	3,762
Payments		(1,813)	(2,057)
Non-cash	[1]		(310)
Liability, ending balance			4,653
Corporate and Other [Member]
Restructuring Cost And Reserve [Line Items]
Liability, beginning balance		1,585	8
Net accruals		39	3,519
Payments		$ (1,624)	(2,381)
Non-cash	[1]		(1,131)
Liability, ending balance			$ 15

[1] Primarily represents the reclassification of current period charges for share-based compensation.