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Goodwill and Other Intangible Assets - Summary of Weighted Average Amortization Periods for Amortizable Intangible Assets (Detail)	12 Months Ended
	Dec. 31, 2016
Non-compete agreements [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	5 years
Favorable leases [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	15 years 8 months 12 days
Pharmacy customer prescription lists [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years 4 months 24 days
Customer relationships [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	20 years
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	7 years
Franchise fees and other [Member]
Finite Lived Intangible Assets [Line Items]
Weighted Average Useful Life	9 years 2 months 12 days

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

+ Details

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Period Type:	duration

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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- Details

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- Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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