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Acquisitions - Summary of Adjusted Consideration Paid for the Acquisitions and Amounts of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2015
Minimum [Member]
Business Acquisition [Line Items]
Estimated useful lives	1 year
Maximum [Member]
Business Acquisition [Line Items]
Estimated useful lives	20 years
Series of Individually Immaterial Business Acquisitions | Trade Names [Member] | Minimum [Member]
Business Acquisition [Line Items]
Estimated useful lives	1 year
Series of Individually Immaterial Business Acquisitions | Trade Names [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated useful lives	20 years
Series of Individually Immaterial Business Acquisitions | Customer Relationships [Member] | Minimum [Member]
Business Acquisition [Line Items]
Estimated useful lives	6 years
Series of Individually Immaterial Business Acquisitions | Customer Relationships [Member] | Maximum [Member]
Business Acquisition [Line Items]
Estimated useful lives	10 years

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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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Details

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- Details

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