Number of largest distributors.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Amount before tax of foreign currency transaction unrealized gain (loss) recognized in the income statement.

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Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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No definition available.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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No definition available.

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Description of Business and Basis of Presentation - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Segment Distributor	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Number of reportable segments \| Segment	2
Ownership interest (in hundredths)	100.00%
Other, net	$ (24,287)	$ (19,134)	$ (29,250)
Restatement Adjustment [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
(Gain) loss on foreign currency transactions		16,100	22,400
Other, net		$ 16,100	$ 22,400
Minimum [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Ownership interest (in hundredths)	20.00%
Maximum [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Ownership interest (in hundredths)	50.00%
Customer Concentration Risk [Member] \| Cable and Satellite Distribution Systems [Member] \| Four Largest Distributers [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Concentration risks	78.60%
Number of largest distributors \| Distributor	4
Customer Concentration Risk [Member] \| Cable and Satellite Distribution Systems [Member] \| Eight Largest Distributers [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Number of largest distributors \| Distributor	8
Customer Concentration Risk [Member] \| Cable and Satellite Distribution Systems [Member] \| Eight Largest Distributers [Member] \| Minimum [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Concentration risks	97.80%
Customer Concentration Risk [Member] \| Advertising Revenue [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Concentration risks	70.30%	71.00%
UKTV [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Ownership interest (in hundredths)	50.00%	50.00%
Food Network Partnership [Member]
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Ownership interest (in hundredths)	68.70%