Intangible Assets, net (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Operation	Sep. 30, 2016 USD ($)	[1]	Jun. 30, 2016 USD ($)	[1]	Mar. 31, 2016 USD ($)	[1]	Dec. 31, 2015 USD ($)		Sep. 30, 2015 USD ($)	[1]	Jun. 30, 2015 USD ($)	[1]	Mar. 31, 2015 USD ($)	[1]	Dec. 31, 2014 USD ($)
Finite-Lived Intangible Assets [Line Items]
Total	$ 38,060	$ 33,389		$ 33,909		$ 34,428		$ 30,296	[1]	$ 23,798		$ 24,167		$ 24,537
Number of acquired operations | Operation	2
Tradenames [Member]
Finite-Lived Intangible Assets [Line Items]
Total	$ 21,234							17,660
Accumulated amortization	$ 0							170
Estimated useful life	6 years
Referral Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Total	$ 14,859							10,866
Accumulated amortization	$ 5,275							3,763
Referral Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Referral Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	16 years
Referral Relationships [Member] | Physician Services [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization																$ 156
Non-compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Total	$ 1,967							1,770
Accumulated amortization	$ 3,380							$ 2,855
Non-compete Agreements [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	5 years
Non-compete Agreements [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	6 years
Non-compete Agreements [Member] | Physician Services [Member]
Finite-Lived Intangible Assets [Line Items]
Accumulated amortization																$ 270

[1] as restated