Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Net revenue		$ 460,635	$ 454,913	$ 1,317,321	$ 1,321,159
Operating expenses:
Practice salaries and benefits		309,904	301,306	909,168	880,686
Practice supplies and other operating expenses		22,440	22,581	66,455	72,688
General and administrative expenses		66,346	63,284	194,276	185,318
Depreciation and amortization		7,195	6,408	20,749	18,830
Transformational and restructuring related expenses		34,291	12,766	60,846	32,025
Total operating expenses		440,176	406,345	1,251,494	1,189,547
Income from operations		20,459	48,568	65,827	131,612
Investment and other income		10,534	802	13,064	2,777
Interest expense		(27,250)	(29,909)	(83,180)	(91,271)
Equity in earnings of unconsolidated affiliates		282	786	1,081	1,753
Total non-operating expenses		(16,434)	(28,321)	(69,035)	(86,741)
Income (loss) from continuing operations before income taxes		4,025	20,247	(3,208)	44,871
Income tax provision		(6,677)	(7,360)	(10,859)	(12,590)
(Loss) income from continuing operations		(2,652)	12,887	(14,067)	32,281
Loss from discontinued operations, net of tax		(38,392)	(1,268,803)	(718,125)	(1,539,314)
Net loss		$ (41,044)	$ (1,255,916)	$ (732,192)	$ (1,507,033)
(Loss) income from continuing operations:
Basic		$ (0.03)	$ 0.16	$ (0.17)	$ 0.39
Diluted		(0.03)	0.16	(0.17)	0.38
Loss from discontinued operations:
Basic		(0.46)	(15.39)	(8.62)	(18.36)
Diluted		(0.46)	(15.31)	(8.62)	(18.26)
Net loss:
Basic		(0.49)	(15.23)	(8.79)	(17.97)
Diluted		$ (0.49)	$ (15.15)	$ (8.79)	$ (17.88)
Weighted average common shares:
Basic		83,862	82,441	83,260	83,846
Diluted	[1]	83,862	82,883	83,260	84,302

[1] Due to a loss from continuing operations for the three months and nine months ended September 30, 2020, no incremental shares are included because the effect would be antidilutive.