Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Income Taxes [Abstract]
Minimum percentage of owned subsidiaries included in consolidated federal income tax return (in hundredths)	80.00%	80.00%	80.00%
Current expense (benefit) [Abstract]
Federal	$ (2,716)	$ 7,639	$ 6,124
State and other	17,134	8,798	7,819
Total current expense	14,418	16,437	13,943
Deferred expense (benefit) [Abstract]
Federal	120,234	71,832	(129,290)
State	(24,552)	23,918	(2,822)
Total deferred expense (benefit)	95,682	95,750	(132,113)
Tax expense relating to uncertain tax positions, including accrued interest	3,667	990	4,251
Income tax expense (benefit)	113,767	113,177	(113,918)
Reconciliation of the statutory federal income tax to the effective income tax [Abstract]
Federal tax expense (benefit) at statutory federal rate	112,531	82,953	(130,092)
State income taxes, net of federal benefit	11,784	19,577	8,716
Changes in the valuation allowance	(2,428)	(1,427)	6,602
Change in the state rate used to determine deferred taxes, net of federal benefit	5,842	(6,764)	(11,274)
Tax expense relating to uncertain tax positions, including accrued interest, net of deferred tax benefits	1,202	(105)	1,417
Non-deductible officers' compensation	3,989	7,264	5,934
Other non-deductible expenses	3,246	3,340	1,329
Increase in certain state and city net operating loss carry forwards pursuant to the finalization of an examination with a taxing authority	(18,951)	0	0
Elimination of state carry forwards pursuant to LLC conversions	0	9,095	0
Research credit	(1,800)	(1,200)	(811)
Loss (gain) attributable to noncontrolling interests	(227)	96	2,837
Other	(1,421)	348	1,424
Income tax expense (benefit)	113,767	113,177	(113,918)
Deferred Tax Asset (Liability), Current [Abstract]
NOLs and tax credit carry forwards	96,570	477,441
Compensation and benefit plans	43,074	33,396
Allowance for doubtful accounts	6,260	4,445
Other liabilities	8,626	19,944
Deferred tax asset	154,530	535,226
Valuation allowance	(2,217)	(10,194)
Net deferred tax asset, current	152,313	525,032
Investments	(48,668)	(7,612)
Deferred tax liability, current	(48,668)	(7,612)
Net deferred tax asset, current	103,645	517,420
Deferred Tax Asset (Liability), Noncurrent [Abstract]
NOLs and tax credit carry forwards	513,319	41,657
Compensation and benefit plans	57,929	80,097
Investments	4,565	0
Partnership investments	(161,501)	(184,438)
Other	8,483	13,636
Deferred tax asset	745,797	319,828
Valuation allowance	(11,224)	(5,962)
Net deferred tax asset, noncurrent	734,573	313,866
Fixed assets and intangibles	(620,987)	(361,949)
Investments	0	(20,504)
Other assets	(14,299)	(16,789)
Deferred tax liability, noncurrent	(635,286)	(399,242)
Net deferred tax asset (liability), noncurrent	99,287	(85,376)
Total net deferred tax asset	202,932	432,044
Operating Loss and Tax Credit Carryforwards [Abstract]
Consolidated federal net operating loss carryforwards	1,561,663
Operating loss carryforwards, expiration dates	2021 through 2026
NOL for which a deferred tax asset has been recorded	1,354,592
NOL for which a deferred tax asset has not been recorded	207,071
Excess tax deduction resulting from exercise and issuance of certain share-based awards over aggregate compensation expense for such awards for the current period	30,162
Excess tax deduction resulting from exercise and issuance of certain share-based awards over aggregate compensation expense for such awards on a cumulative basis	195,156
Federal alternative minimum tax credit carryforwards which do not expire	22,061
Increase in NOL due to change in tax accounting method for certain installation costs with regard to Optimum Online and Optimum Voice businesses	270,000
Reduction in income tax basis of certain fixed assets	270,000
Reconciliation of unrecognized tax benefits associated with uncertain tax positions, excluding associated deferred tax benefits and accrued interest [Roll Forward]
Balance, beginning of period	62,404
Increases related to prior year tax positions	3,971
Decreases related to prior year tax positions	(2,008)
Increases related to current year tax positions	619
Settlements	(3,979)
Lapse of statute of limitations	(909)
Balance, end of period	60,098	62,404
Decrease in income tax expense if all uncertain tax positions were sustained	56,203
Interest expense included in income tax expense attributable to continuing operations	1,210	385	331
Accrued interest on uncertain tax positions included in other accrued expenses	1,306
CSC Holdings [Member]
Income Taxes [Abstract]
Minimum percentage of owned subsidiaries included in consolidated federal income tax return (in hundredths)	80.00%	80.00%	80.00%
Current expense (benefit) [Abstract]
Federal	6,190	11,174	9,236
State and other	17,134	8,798	7,819
Total current expense	23,324	19,972	17,055
Deferred expense (benefit) [Abstract]
Federal	226,188	125,182	(82,972)
State	(2,293)	38,111	7,393
Total deferred expense (benefit)	223,895	163,293	(75,580)
Tax expense relating to uncertain tax positions, including accrued interest	3,667	990	4,251
Income tax expense (benefit)	250,886	184,255	(54,273)
CSC Holdings payable due to Cablevision representing the estimated federal income tax liability of CSC Holdings as determined on a stand-alone basis as if CSC Holdings filed separate federal consolidated income tax returns	10,091
Reconciliation of the statutory federal income tax to the effective income tax [Abstract]
Federal tax expense (benefit) at statutory federal rate	235,187	144,808	(77,090)
State income taxes, net of federal benefit	30,263	29,777	15,450
Changes in the valuation allowance	(2,428)	(1,427)	6,602
Change in the state rate used to determine deferred taxes, net of federal benefit	2,925	(8,510)	(11,366)
Tax expense relating to uncertain tax positions, including accrued interest, net of deferred tax benefits	1,202	(105)	1,417
Non-deductible officers' compensation	3,989	7,264	5,934
Other non-deductible expenses	3,246	3,340	1,329
Increase in certain state and city net operating loss carry forwards pursuant to the finalization of an examination with a taxing authority	(18,951)	0	0
Elimination of state carry forwards pursuant to LLC conversions	0	9,095	0
Research credit	(1,800)	(1,200)	(811)
Loss (gain) attributable to noncontrolling interests	(227)	96	2,837
Other	(2,520)	1,117	1,425
Income tax expense (benefit)	250,886	184,255	(54,273)
Deferred Tax Asset (Liability), Current [Abstract]
NOLs and tax credit carry forwards	152,163	270,594
Compensation and benefit plans	43,074	33,396
Allowance for doubtful accounts	6,260	4,445
Other liabilities	8,626	19,944
Deferred tax asset	210,123	328,379
Valuation allowance	(5,968)	(10,127)
Net deferred tax asset, current	204,155	318,252
Investments	(48,668)	(7,612)
Deferred tax liability, current	(48,668)	(7,612)
Net deferred tax asset, current	155,487	310,640
Deferred Tax Asset (Liability), Noncurrent [Abstract]
NOLs and tax credit carry forwards	41,634	0
Compensation and benefit plans	57,929	80,897
Investments	4,565	0
Partnership investments	(161,501)	(13,636)
Other	8,483	13,636
Deferred tax asset	274,112	278,171
Valuation allowance	(7,473)	(6,029)
Net deferred tax asset, noncurrent	266,639	272,142
Fixed assets and intangibles	(620,987)	(361,949)
Investments	0	(20,504)
Other assets	(14,299)	(16,790)
Deferred tax liability, noncurrent	(635,286)	(399,243)
Net deferred tax asset (liability), noncurrent	(368,647)	(127,101)
Total net deferred tax asset	(213,160)	183,539
Operating Loss and Tax Credit Carryforwards [Abstract]
Consolidated federal net operating loss carryforwards	377,956
Operating loss carryforwards, expiration dates	2024 and 2026
NOL for which a deferred tax asset has been recorded	231,349
NOL for which a deferred tax asset has not been recorded	146,607
Excess tax deduction resulting from exercise and issuance of certain share-based awards over aggregate compensation expense for such awards for the current period	30,162
Excess tax deduction resulting from exercise and issuance of certain share-based awards over aggregate compensation expense for such awards on a cumulative basis	134,692
Federal alternative minimum tax credit carryforwards which do not expire	$ 41,261
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Income tax examination, year(s) under examination	2006-2008
State of New York [Member]
Income Tax Examination [Line Items]
Income tax examination, year(s) under examination	2006-2008

The consolidated federal net operating loss carryforwards for which a deferred tax asset has not been recorded.

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The noncurrent portion as of the balance sheet date of the estimated future tax effects attributable to investments in securities and financial instruments that are classified as noncurrent for GAAP purposes.

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The sum of the tax effect as of the balance sheet date of the current portion of operating loss carryforwards and unused tax credit carryforwards.

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The sum of the tax effect as of the balance sheet date of the noncurrent portion of operating loss carryforwards and unused tax credit carryforwards.

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The consolidated federal net operating loss carryforwards for which a deferred tax asset has been recorded.

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The tax effect as of the balance sheet date of the noncurrent portion of estimated future tax deductions arising from other temporary differences not otherwise specified in the taxonomy.

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The tax effect as of the balance sheet date of the difference between the tax basis and the generally accepted accounting principles basis of a company's investment in partnerships; commonly referred to as the outside basis difference.

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The sum of the tax effects as of the balance sheet date of the current portion of the estimated future tax deductions arising from all employee compensation and benefits costs, which can generally be deducted for tax purposes when the actual items are paid, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The sum of the tax effects as of the balance sheet date of the noncurrent portion of the estimated future tax deductions arising from all employee compensation and benefits costs, which can generally be deducted for tax purposes when the actual items are paid, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The sum of the tax effects as of the balance sheet date of the current portion of the estimated future tax deductions arising from other liabilities, which can generally be deducted for tax purposes when the items are paid, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The noncurrent amount as of the balance sheet date of the estimated future tax effects attributable to the difference between the tax basis of fixed assets and intangible assets and the basis of fixed assets and intangible assets computed in accordance with generally accepted accounting principles. The difference in basis will increase future taxable income when such difference reverses.

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The current portion as of the balance sheet date of the estimated future tax effects attributable to investments in securities and financial instruments that are classified as current for GAAP purposes.

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The excess tax deduction resulting from the exercise and issuance of certain share-based awards over the aggregate compensation expense for such awards on a cumulative basis.

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The excess tax deduction resulting from the exercise and issuance of certain share-based awards over the aggregate compensation expense for such awards for the current period.

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The portion of the difference, between total income tax expense (benefit) as reported in the Income Statement for the year/accounting period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to an increase in certain state and city net operating loss carry forwards pursuant to the finalization of an examination with a taxing authority during the year/accounting period.

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The portion of the difference, between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to changes in the state rate used to determine deferred taxes, net of federal benefit.

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The sum of the differences between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the elimination of state tax carryforwards pursuant to LLC conversions.

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The portion of the difference between total income tax expense (benefit) as reported in the Income Statement for the period and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to differences in the deductibility of officers' compensation costs in accordance with generally accepted accounting principles and enacted tax laws.

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The sum of the differences between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to uncertain tax positions, including accrued interest, net of deferred tax benefits,

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The increase in the NOL due to the IRS approving a change in the tax accounting method for certain installation costs with regard to the Company's Optimum Online and Optimum Voice businesses.

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The income tax impact of pretax income or loss that is attributable to noncontrolling interests.

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The minimum percentage of owned subsidiaries which are included in the Company's consolidated federal income tax return

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The income tax impact of GAAP expenses that are not deductible for income tax purposes.

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The reduction in the income tax basis of certain fixed assets due to the IRS approving a change in the tax accounting method for certain installation costs with regard to the Company's Optimum Online and Optimum Voice businesses.

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The amount of any current tax-related balances due to affiliates for the current year.

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Tax expense relating to uncertain tax positions, including accrued interest.

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The gross amount of increases/(decreases) in unrecognized tax benefits resulting from settlements with taxing authorities.

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This element represents the amount of interest expense included in Other Accrued Expenses as of the date of the statement of financial position for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal tax law to the domestic taxable income (loss) from continuing operations.

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The component of income tax expense for the period representing amounts of income taxes paid or payable (or refundable) for the period for all income tax obligations as determined by applying the provisions of relevant enacted tax laws to relevant amounts of taxable income (loss) from continuing operations.

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The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted state and local tax law to relevant amounts of taxable income (loss) from continuing operations.

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The component of total income tax expense for the period comprised of the net change during the period in the entity's domestic deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federally enacted tax law.

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The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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The component of total income tax expense for the period comprised of the net change in the entity's state and local deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the applicable enacted tax laws.

+ References

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The current portion of the aggregate tax effects as of the balance sheet date of all future tax deductions arising from temporary differences between tax basis and generally accepted accounting principles basis recognition of assets, liabilities, revenues and expenses, which can only be deducted for tax purposes when permitted under enacted tax laws; before the valuation allowance, if any, to reduce such amount to net realizable value. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference.

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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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For entities that net deferred tax assets and tax liabilities, represents the net amount of deferred tax assets (after reduction for valuation allowance) and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities that are classified as current in the financial statements, or that are expected to reverse in the next twelve months (or normal operating cycle, if longer). A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference.

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The tax effect as of the balance sheet date of the amount of future tax deductions arising from unused alternative minimum tax credit carryforwards; a tax credit carryforward is the amount by which tax credits available for utilization exceeded statutory limits on inclusion in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization.

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The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated losses reflected in the allowance for doubtful accounts, which can only be deducted for tax purposes when actual bad debts are known, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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The allocated portion as of the balance sheet date of a valuation allowance pertaining to a deferred tax asset classified as current for which, based on the weight of available evidence, it is more likely than not, such asset will not be fully realized through future reductions of tax-based income.

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The allocated portion as of the balance sheet date of a valuation allowance pertaining to a deferred tax asset classified as noncurrent for which, based on the weight of available evidence, it is more likely than not, such asset will not be fully realized through future reductions of tax-based income.

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Represents the current portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A current taxable temporary difference is a difference between the tax basis and the carrying amount of a current asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference.

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Represents the noncurrent portion of deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A noncurrent taxable temporary difference is a difference between the tax basis and the carrying amount of a noncurrent asset or liability in the financial statements prepared in accordance with generally accepted accounting principles. In a classified statement of financial position, an enterprise shall separate deferred tax liabilities and assets into a current amount and a noncurrent amount. Deferred tax liabilities and assets shall be classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. A deferred tax liability or asset that is not related to an asset or liability for financial reporting, including deferred tax assets related to carryforwards, shall be classified according to the expected reversal date of the temporary difference.

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The cumulative amount of the estimated future tax effects attributable to other temporary differences not otherwise specified in this taxonomy that were expensed for tax purposes but capitalized in conformity with generally accepted accounting principles, or which were recognized as revenue under GAAP but not for tax purposes, which will reverse in future periods.

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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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The tax year(s) being audited in connection with the income tax examination.

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The sum of the current income tax expense (benefit) and the deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Regulation S-X (SX)

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-Name Statement of Financial Accounting Standard (FAS)

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The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The amount of income tax expense (benefit) for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The portion of the difference between total income tax expense (benefit) as reported in the Income Statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to research tax credits generated or utilized under enacted tax laws during the period.

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The sum of domestic, foreign and state and local operating loss carryforwards, before tax effects, available to reduce future taxable income under enacted tax laws.

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The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The gross amount of unrecognized tax benefits (tax reductions recognized in financial reports but excluded from tax returns) pertaining to uncertain tax positions taken in tax returns as of the beginning balance sheet date, excluding amounts pertaining to examined tax returns.

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-Name FASB Interpretation (FIN)

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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-Name FASB Interpretation (FIN)

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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