CONDENSED CONSOLIDATED AND COMBINED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Apr. 29, 2016
Statement Of Financial Position [Abstract]
Allowance for doubtful patient accounts	$ 357,197	$ 360,796
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	30,203,170	29,482,050
Common stock, shares outstanding	30,203,170	29,482,050	28,412,054