Interim Financial Information (Unaudited) (Narrative) (Details) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Quarterly Financial Information Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 56.9

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates, net of one-time transition tax liability, net of foreign taxes deemed paid.

No definition available.

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Namespace Prefix:	amcx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration