Acquisitions (Second quarter 2015) - Additional Information (Detail) - Acquisition of Client Lists [Member] $ in Millions	3 Months Ended
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
Number of businesses acquired	0	0
Employee Services [Member]
Business Acquisition, Contingent Consideration [Line Items]
Number of client list purchased \| Client_List	2,000,000	1	2

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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

Name:	us-gaap_PaymentsToAcquireBusinessesGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration