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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
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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

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- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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- Details
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