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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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