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