Income Taxes Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts receivable reserves	$ 66,102,000	$ 77,610,000
Net operating loss (“NOL”) carryforwards	144,953,000	76,809,000
Accrued liabilities	67,549,000	116,162,000
Other	19,996,000us-gaap_DeferredTaxAssetsOther	18,030,000us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets, net of valuation allowances	298,600,000us-gaap_DeferredTaxAssetsGross	288,611,000us-gaap_DeferredTaxAssetsGross
Valuation allowances	(95,712,000)	(24,159,000)
Gross deferred tax assets, net of valuation allowances	202,888,000us-gaap_DeferredTaxAssetsNet	264,452,000us-gaap_DeferredTaxAssetsNet
Amortization of intangibles	643,862,000	623,087,000
Contingent convertible debentures interest	349,892,000	412,305,000
Fixed assets and depreciation methods	39,795,000	73,538,000
Subsidiary stock basis	10,810,000	10,776,000
Other	35,576,000us-gaap_DeferredTaxLiabilitiesOther	22,385,000us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liabilities	1,079,935,000us-gaap_DeferredTaxLiabilities	1,142,091,000us-gaap_DeferredTaxLiabilities
deferred tax benefit, ferderal, state and foreign	145,000,000
deferred federal tax asset, net	23,000,000ocr_DeferredFederalTaxAssetNet
deferred state tax asset, net	41,000,000ocr_DeferredStateTaxAssetNet
deferred foreign tax asset, net	81,000,000ocr_DeferredForeignTaxAssetNet
Capital Loss Carryforward [Member]
Valuation allowances	(81,000,000)
Capital Loss Carryforward [Member] \| Hospice Disposal Group [Member] [Member]
Valuation allowances	(76,000,000)
State Net Operating loss [Member]
Valuation allowances	$ (15,000,000)

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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