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Condensed Consolidated Statements Of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Net patient service revenue $ 449,530 $ 393,402 $ 872,146 $ 775,685
Operating expenses:        
Practice salaries and benefits 275,951 235,292 548,212 479,186
Practice supplies and other operating expenses 17,956 16,253 34,941 31,343
General and administrative expenses 48,200 42,702 95,069 84,500
Depreciation and amortization 7,687 6,032 14,800 11,813
Total operating expenses 349,794 300,279 693,022 606,842
Income from operations 99,736 93,123 179,124 168,843
Investment income 365 329 793 654
Interest expense (848) (988) (1,402) (1,899)
Income before income taxes 99,253 92,464 178,515 167,598
Income tax provision 38,709 36,523 69,621 66,201
Net income $ 60,544 $ 55,941 $ 108,894 $ 101,397
Net income:        
Basic $ 1.25 $ 1.18 $ 2.25 $ 2.14
Diluted $ 1.22 $ 1.15 $ 2.20 $ 2.09
Weighted average shares:        
Basic 48,543 47,531 48,408 47,341
Diluted 49,545 48,730 49,474 48,547