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Components of Changes in Healthcare Costs Payable (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Medical Expense And Medical Claims Payable [Line Items] |  |
Healthcare costs payable, beginning of the year | $ 332,102 |
Less: Claims paid |  |
Healthcare costs payable, end of the year | 336,381 | $ 332,102
Healthcare Cost |  |
Medical Expense And Medical Claims Payable [Line Items] |  |
Healthcare costs payable, beginning of the year | 212,641 | 214,405
Add: Components of incurred healthcare costs |  |
Current year | 1,673,742 | 1,587,036
Prior years | (141) | 1,523
Total incurred healthcare costs | 1,673,601 | 1,588,559
Less: Claims paid |  |
Current year | 1,473,723 | 1,397,378
Prior years | 198,244 | 192,945
Total claims paid | 1,671,967 | 1,590,323
Healthcare costs payable, end of the year | $ 214,275 | $ 212,641

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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65670824&loc=d3e14764-158437 + Details
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