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Business Acquisitions - Schedule of Pro Forma Information Combines Consolidated Results of Company and Business Acquisitions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Business Combinations [Abstract]
Net patient service revenue	$ 1,639,874	$ 1,600,939
Net income	$ 207,443	$ 202,085
Net income per share, Basic	$ 4.19	$ 4.16
Net income per share, Diluted	$ 4.11	$ 4.08
Weighted average shares, Basic	49,511	48,569
Weighted average shares, Diluted	50,481	49,570
Effective tax rate	38.00%	38.80%

X

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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