CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 449,510	$ 332,610
Accounts receivable, trade (less allowance for doubtful accounts)	256,389	315,113
Prepaid expenses and other current assets	139,997	131,841
Amounts due from affiliates	2,673	5,339
Deferred tax asset	325,378	139,523
Investment securities pledged as collateral	449,741	401,417
Assets held for sale	34,513	51,709
Total current assets	1,658,201	1,377,552
Property, plant and equipment, net of accumulated depreciation	2,967,316	2,929,933
Other receivables	3,865	4,268
Investment securities pledged as collateral	449,741	401,417
Derivative contracts	18,252	3,143
Other assets	35,692	40,251
Amortizable intangible assets, net of accumulated amortization	67,220	71,260
Indefinite-lived cable television franchises	731,848	731,848
Other indefinite-lived intangible assets	32,550	32,550
Goodwill	264,690	264,690
Deferred financing costs, net of accumulated amortization	113,923	101,789
Assets held for sale	1,244,802	1,291,588
Total assets	7,588,100	7,250,289
Current Liabilities:
Accounts payable	427,234	457,076
Accrued liabilities	471,295	504,931
Amounts due to affiliates	24,817	36,397
Deferred tax liability	(325,378)	(139,523)
Deferred revenue	45,922	56,089
Liabilities under derivative contracts	114,617	134,524
Credit facility debt	43,500	165,334
Collateralized indebtedness	273,636	248,760
Capital lease obligations	10,794	11,009
Notes payable	2,602	10,676
Senior notes	200,807	0
Liabilities held for sale	57,021	72,217
Total current liabilities	1,672,245	1,697,013
Deferred revenue	5,471	6,946
Liabilities under derivative contracts	4,845	13,739
Other liabilities	334,315	295,433
Deferred tax liability	439,059	210,347
Credit facility debt	3,893,592	3,748,667
Collateralized indebtedness	417,273	307,392
Capital lease obligations	49,600	45,560
Notes payable	1,708	1,909
Senior notes and debentures	5,291,948	5,488,219
Liabilities held for sale	1,043,528	1,061,071
Total liabilities	13,153,584	12,876,296
Commitments and contingencies
Redeemable noncontrolling interests	11,412	11,999
Stockholders'/Member's Deficiency:
Preferred Stock, $.01 par value, 50,000,000 shares authorized, none issued	0	0
Paid-in capital	925,135	972,274
Accumulated deficit	(4,892,742)	(5,011,960)
Total stockholders'/member's deficiency before treasury stock, accumulated other comprehensive loss and noncontrolling interest	(3,964,153)	(4,036,267)
Treasury stock, at cost (78,316,141 and 77,189,014 CNYG Class A common shares)	(1,583,521)	(1,572,134)
Accumulated other comprehensive loss	(30,344)	(30,763)
Total stockholders'/member's deficiency	(5,578,018)	(5,639,164)
Noncontrolling interest	1,122	1,158
Total deficiency	(5,576,896)	(5,638,006)
Total liabilities and stockholders'/member's deficiency	7,588,100	7,250,289
CNYG Class A Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock	2,913	2,878
CNYG Class B Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock	541	541
RMG Class A Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock	0	0
RMG Class B Common Stock [Member]
Stockholders'/Member's Deficiency:
Common stock	0	0
CSC Holdings, LLC [Member]
Current Assets:
Cash and cash equivalents	400,390	256,744
Accounts receivable, trade (less allowance for doubtful accounts)	256,389	315,113
Prepaid expenses and other current assets	136,840	119,640
Amounts due from affiliates	386,587	487,352
Deferred tax asset	(67,894)	(4,560)
Investment securities pledged as collateral	449,741	401,417
Assets held for sale	34,513	51,709
Total current assets	1,664,460	1,631,975
Property, plant and equipment, net of accumulated depreciation	2,967,316	2,929,933
Other receivables	2,087	2,490
Investment securities pledged as collateral	449,741	401,417
Derivative contracts	18,252	3,143
Other assets	35,692	40,251
Amortizable intangible assets, net of accumulated amortization	67,220	71,260
Indefinite-lived cable television franchises	731,848	731,848
Other indefinite-lived intangible assets	32,550	32,550
Goodwill	264,690	264,690
Deferred financing costs, net of accumulated amortization	68,218	53,024
Assets held for sale	1,244,802	1,291,588
Total assets	7,546,876	7,454,169
Current Liabilities:
Accounts payable	427,234	457,076
Accrued liabilities	413,442	446,766
Amounts due to affiliates	24,805	33,311
Deferred tax liability	67,894	4,560
Deferred revenue	45,922	56,089
Liabilities under derivative contracts	114,617	134,524
Credit facility debt	43,500	165,334
Collateralized indebtedness	273,636	248,760
Capital lease obligations	10,794	11,009
Notes payable	2,602	10,676
Senior notes	200,807	0
Liabilities held for sale	57,021	72,217
Total current liabilities	1,682,274	1,640,322
Deferred revenue	5,471	6,946
Liabilities under derivative contracts	4,845	13,739
Other liabilities	331,026	292,828
Deferred tax liability	549,654	577,668
Credit facility debt	3,893,592	3,748,667
Collateralized indebtedness	417,273	307,392
Capital lease obligations	49,600	45,560
Notes payable	1,708	1,909
Senior notes and debentures	2,399,668	2,596,683
Liabilities held for sale	1,043,528	1,061,071
Total liabilities	10,378,639	10,292,785
Commitments and contingencies
Redeemable noncontrolling interests	11,412	11,999
Stockholders'/Member's Deficiency:
Accumulated deficit	(2,905,018)	(3,106,148)
Senior notes due from Cablevision	(753,717)	(753,717)
Other member's equity	844,782	1,038,855
Total stockholders'/member's deficiency before treasury stock, accumulated other comprehensive loss and noncontrolling interest	(2,813,953)	(2,821,010)
Accumulated other comprehensive loss	(30,344)	(30,763)
Total stockholders'/member's deficiency	(2,844,297)	(2,851,773)
Noncontrolling interest	1,122	1,158
Total deficiency	(2,843,175)	(2,850,615)
Total liabilities and stockholders'/member's deficiency	$ 7,546,876	$ 7,454,169