Significant Accounting Policies - Schedule of Other Current Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Other Liabilities, Current [Abstract] | ||
| Interest payable | $ 19,206 | $ 5,410 |
| Current taxes payable | 2,622 | 1,977 |
| Insurance liabilities | 6,625 | 5,476 |
| Third-party settlements | 179 | 5,222 |
| Acquisition consideration payable | 0 | 16,768 |
| Amounts due to patients and payors | 12,221 | 11,424 |
| Tax receivable agreement liability | 999 | 0 |
| Contingent acquisition compensation liability | 4,589 | 0 |
| Other accrued expenses | 22,552 | 22,133 |
| Total | $ 68,993 | $ 68,410 |