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Discontinued Operations, Exit Activities, and Clinic Obligations (Summary of Company's Operating Results for Discontinued Operations) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Discontinued Operations, Exit Activities, and Clinic Obligations [Abstract]
Income before income taxes from discontinued operations	$ 140	$ 834
Income tax provision	36	301
Income from discontinued operations, net of tax	$ 104	$ 533

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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