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Acquisitions (Contingent earnouts related to prior acquisitions) - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
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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 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 + Details
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