Consolidated Statements of Net Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Net Income [Abstract]
Net patient revenues	$ 60,782	$ 57,332	$ 183,333	$ 167,882
Other revenues	2,071	2,343	6,061	8,446
Net revenues	62,853	59,675	189,394	176,328
Clinic operating costs:
Salaries and related costs	33,376	32,430	98,846	93,189
Rent, clinic supplies, contract labor and other	12,844	12,012	38,320	34,695
Provision for doubtful accounts	1,259	1,426	3,656	2,554
Closure costs	5	13	76	44
Total clinic operating costs	47,484	45,881	140,898	130,482
Gross margin	15,369	13,794	48,496	45,846
Corporate office costs	5,977	5,142	18,635	17,630
Operating income	9,392	8,652	29,861	28,216
Interest and other income, net	1	4	4	8
Interest expense	(142)	(149)	(449)	(331)
Income before taxes	9,251	8,507	29,416	27,893
Provision for income taxes	2,953	2,654	8,992	8,252
Net income including noncontrolling interests	6,298	5,853	20,424	19,641
Less: net income attributable to noncontrolling interests	(1,735)	(1,754)	(6,534)	(6,896)
Net income attributable to common shareholders	$ 4,563	$ 4,099	$ 13,890	$ 12,745
Earnings per share attributable to common shareholders:
Basic	$ 0.39	$ 0.35	$ 1.18	$ 1.08
Diluted	$ 0.38	$ 0.34	$ 1.17	$ 1.06
Shares used in computation:
Basic	11,827	11,886	11,778	11,824
Diluted	11,928	12,011	11,892	12,007
Dividends declared per common share	$ 0.09	$ 0.08	$ 0.27	$ 0.24