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Acquisitions (Forth Quarter 2015) - Additional Information (Detail) $ in Millions | Dec. 01, 2015 USD ($) | Oct. 01, 2015 USD ($) Participants
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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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