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Percentage of Net Revenue and Total Accounts Receivable (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Sales Revenue, Net | Payor A [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 14.10% | 14.40%
Sales Revenue, Net | Payor B [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 18.10% | 17.80%
Sales Revenue, Net | Payor C [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 11.10% | 12.30%
Sales Revenue, Net | Payor D [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 11.30% | 14.00%
Accounts Receivable | Payor D [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 23.80% | 37.40%
Accounts Receivable | Payor E [Member] |  |
Accounts Receivable And Net Revenue [Line Items] |  |
Concentration Risk, Percentage | 30.50% | 47.10%

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