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Acquisitions - Acquisitions of Provider Companies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 01, 2016 | Dec. 31, 2016 | Mar. 31, 2017 | Aug. 23, 2016
Common Class B |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Share price (in dollars per share) | $ 20 |  |  | $ 20
Provider Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price | $ 34.1 |  |  |
Initial working capital estimate | 1.3 |  |  |
Earnout maximum | 9.0 |  | $ 9.0 |
Installment consideration payment | 3.8 |  |  |
Installment payment | $ 0.4 |  |  |
Provider Companies | Common Class B |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares issued for acquisition (shares) | 699,742 |  |  |
Issuance of Class B common stock to affiliates | $ 14.0 |  |  |
Fair Value, Measurements, Recurring | Provider Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration - earnout obligations incurred in connection with acquisitions |  | $ 4.8 |  |
Revolving Credit Facility | Acquisition Line | Provider Companies |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Borrowing from credit facility | $ 10.6 |  |  |

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