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Business Acquisitions (Schedule Of Pro Forma Information That Combines The Consolidated Results Of Company And Business Acquisitions) (Detail) (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
Business Acquisition [Line Items]        
Net patient service revenue     $ 889,791 $ 862,745
Net income     $ 110,309 [1] $ 109,666 [1]
Net income per share, Basic     $ 2.28 [2] $ 2.32 [2]
Net income per share, Diluted     $ 2.23 [2] $ 2.26 [2]
Weighted average shares, Basic     48,408 [2] 47,341 [2]
Weighted average shares, Diluted     49,474 [2] 48,547 [2]
Effective tax rate     39.00% [1] 39.50% [1]
Basic weighted average shares outstanding 48,543 47,531 48,408 47,341
Diluted weighted average shares outstanding 49,545 48,730 49,474 48,547
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 39.0% for the six months ended June 30, 2012 as compared to 39.5% for the six months ended June 30, 2011.
[2] The comparison of net income per share is affected by the changes in the number of weighted average shares outstanding in each period. The basic and diluted weighted average shares outstanding for the six months ended June 30, 2012 were 48.4 million and 49.5 million, respectively, as compared to 47.3 million and 48.5 million, respectively, for the six months ended June 30, 2011.