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Acquisitions (Third quarter 2015) - Additional Information (Detail) - Acquisition of Client Lists [Member] $ in Millions | 3 Months Ended
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Sep. 30, 2015 USD ($) Business Client_List | Jun. 30, 2015 USD ($) Business Client_List | Mar. 31, 2015 USD ($) Client_List
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Consideration paid in cash | $ 0.2 | $ 3.0 | $ 0.1
Guaranteed future consideration | $ 0.5 |  | $ 0.3
Number of businesses acquired | Business | 0 | 0 |
Employee Services [Member] |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |
Number of client list purchased | Client_List | 2,000,000 | 1 | 2

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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