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Acquisitions (Contingent earnouts related to prior acquisitions) - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Consideration paid in cash for previous acquisitions	$ 7.8	$ 4.1
Number of common stock issued	200,000
Common stock value related to contingent earnouts for previous acquisitions	$ 2.0	$ 0.2

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- Definition

Number of common shares issued.

+ References

No definition available.

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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 30



-Paragraph 7



-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 805



-SubTopic 30



-Section 30



-Paragraph 8



-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477

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- Definition

Cash outflow representing an adjustment to the purchase price of a previous acquisition.

+ References

No definition available.

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