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Results from Discontinued Operations Related to Dialysis and Related Lab Services Segment (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
(Loss) income from discontinued operations | $ (139) | $ (222) | $ (13,162)
Dialysis And Related Lab Services |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net revenues |  |  | 16,648
(Loss) income before income taxes |  |  | 1,896
Income tax (benefit) expense |  |  | 675
(Loss) income from discontinued operations |  |  | $ 1,221

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