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Basis of Reporting for Consolidated Financial Statements - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 Acquisition
Adjusted Earnings Before Interest Taxes Depreciation And Amortization And Other Non Cash Items [Abstract]
Number of acquisitions	4

X

- Definition

Adjusted Earnings Before Interest Taxes Depreciation And Amortization And Other Non Cash Items [Abstract]

+ References

No definition available.

+ Details

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X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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