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Estimated Cost of Providing Uncompensated Care (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 239,620 | $ 213,807 | $ 184,187
Charity Care |  |  |
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | 120,208 | 107,887 | 77,557
Uninsured Discounts |  |  |
Health Care Trust Fund [Line Items] |  |  |
Estimated cost of providing uncompensated care | $ 119,412 | $ 105,920 | $ 106,630

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- Definition Estimated cost of uncompensated care. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition 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. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |