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Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounts Notes And Loans Receivable [Line Items]
Net accounts receivable, percentage of balances more than six months old	14.00%	11.00%
Percentage of outstanding patient accounts receivables to be reserved as per Company's policy	100.00%
Account receivable outstanding, number of months	4 months
Increase in allowance for doubtful accounts	$ 21,470	$ 5,531
Government-based Programs, Medicare and Medicaid | Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of accounts receivable due	80.00%
Health Care Patient | Accounts Receivable
Accounts Notes And Loans Receivable [Line Items]
Percentage of accounts receivable due	1.00%

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- Definition

Patient accounts receivable months outstanding to be reserved per company policy.

+ References

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- Definition

Percentage of Accounts Receivable , 6 months or More Past Due

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- Definition

Percentage of outstanding patient accounts receivables to be reserved when patient pay amounts due are outstanding for more than four months, as per the Company's policy.

+ References

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- Definition

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- Definition

Amount of increase (decrease) in the allowance for doubtful accounts.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

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