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Acquisitions (Forth Quarter 2015) - Additional Information (Detail) $ in Millions	Dec. 01, 2015 USD ($)	Oct. 01, 2015 USD ($) Participants
Pension Resource Group Inc [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated revenue | $		$ 4.8
Pension Resource Group Inc [Member] | Minimum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Number of clients of acquired entity | Participants		500
Pension Resource Group Inc [Member] | Maximum [Member]
Business Acquisition, Contingent Consideration [Line Items]
Number of clients of acquired entity | Participants		60,000
Cottonwood [Member] | Employee Services [Member]
Business Acquisition, Contingent Consideration [Line Items]
Estimated revenue | $	$ 3.1

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