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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	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Business Combinations [Abstract]
Net patient service revenue	$ 1,065,003	$ 1,043,113
Net income	$ 127,820	$ 125,529
Net income per share, Basic	$ 2.58	$ 2.58
Net income per share, Diluted	$ 2.53	$ 2.54
Weighted average shares, Basic	49,434	48,408
Weighted average shares, Diluted	50,471	49,474
Effective tax rate	38.60%	39.00%

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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