Revenue Recognition and Valuation Accounts - Schedule of Allowance for Contractual Discounts and Estimated Uncompensated Care as a Percentage of Gross Segment Accounts Receivable (Detail) |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2016 |
Dec. 31, 2015 |
|
| Revenue Recognition And Valuation Accounts [Abstract] | ||
| Allowance for Contractual Discounts | 59.00% | 56.00% |
| Allowance for Uncompensated Care | 16.00% | 23.00% |