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Accounts Receivable and Net Revenue - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 352,191 us-gaap_AccountsReceivableNetCurrent |  |  |  | $ 285,397 us-gaap_AccountsReceivableNetCurrent |  |  |  | $ 352,191 us-gaap_AccountsReceivableNetCurrent | $ 285,397 us-gaap_AccountsReceivableNetCurrent |
Net patient service revenue | $ 650,525 us-gaap_HealthCareOrganizationRevenue | $ 626,506 us-gaap_HealthCareOrganizationRevenue | $ 595,544 us-gaap_HealthCareOrganizationRevenue | $ 566,338 us-gaap_HealthCareOrganizationRevenue | $ 567,387 us-gaap_HealthCareOrganizationRevenue | $ 554,730 us-gaap_HealthCareOrganizationRevenue | $ 529,180 us-gaap_HealthCareOrganizationRevenue | $ 502,715 us-gaap_HealthCareOrganizationRevenue | $ 2,438,913 us-gaap_HealthCareOrganizationRevenue | $ 2,154,012 us-gaap_HealthCareOrganizationRevenue | $ 1,816,612 us-gaap_HealthCareOrganizationRevenue

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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- Definition Amount of revenues recognized by the entity from providing services to in-patients, outpatients, residents in facilities owned or operated by the entity, from insurance premiums, or from goods provided or services performed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Balance Type: | credit
Period Type: | duration

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- Details
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