CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
ASSETS
Property, plant and equipment, accumulated depreciation	$ 4,044,671
Amortizable intangible assets, accumulated amortization	2,882,787
Accounts receivable, trade allowance for doubtful accounts	$ 13,520
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Treasury Stock, Shares, Acquired	0
CSC Holdings
ASSETS
Property, plant and equipment, accumulated depreciation	$ 4,044,671
Amortizable intangible assets, accumulated amortization	2,882,787
Accounts receivable, trade allowance for doubtful accounts	$ 13,520
Common Class A
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	4,000,000,000	4,000,000,000
Common stock, shares issued (in shares)	496,064,027	246,982,292
Common stock, shares outstanding (in shares)	496,064,027	246,982,292
Common Class B
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	490,086,674	490,086,674
Common stock, shares outstanding (in shares)	212,976,259	490,086,674
Common Class C
Stockholders' Equity:
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	4,000,000,000	4,000,000,000
Common stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	0	0