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Discontinued Operations, Exit Activities, and Clinic Obligations - Additional Information (Detail)	6 Months Ended			12 Months Ended
	Jun. 30, 2016	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Corporate Centers Sold During Period		17	24	41
Corporate Centers Closed During Period	34

X

- Definition

Number of corporate centers closed during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Number of corporate centers sold during the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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