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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 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Business Acquisition [Line Items]        
Net patient service revenue     $ 1,413,535 $ 1,368,210
Net income     $ 184,384 [1] $ 181,623 [1]
Net income per share, Basic     $ 3.80 [2] $ 3.82 [2]
Net income per share, Diluted     $ 3.72 [2] $ 3.73 [2]
Weighted average shares, Basic     48,569 [2] 47,564 [2]
Weighted average shares, Diluted     49,570 [2] 48,683 [2]
Effective tax rate     38.80% [1] 39.00% [1]
Basic weighted average shares outstanding 48,938 47,990 48,569 47,564
Diluted weighted average shares outstanding 49,809 48,935 49,570 48,683
[1] The comparison of net income is affected by the change in the effective tax rate. The effective tax rate was 38.8% for the nine months ended September 30, 2012 as compared to 39.0% for the nine months ended September 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 nine months ended September 30, 2012 were 48.6 million and 49.6 million, respectively, as compared to 47.6 million and 48.7 million, respectively, for the nine months ended September 30, 2011.