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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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Combinations [Abstract]
Net patient service revenue	$ 2,235,170	$ 2,165,561
Net income	$ 287,918	$ 272,657
Net income per share, Basic	$ 2.90	$ 2.80
Net income per share, Diluted	$ 2.85	$ 2.74
Weighted average shares, Basic	99,112	97,386
Weighted average shares, Diluted	100,969	99,382
Effective tax rate	37.44%	37.94%	38.29%

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.

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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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