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Acquisitions (First quarter 2015) - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 01, 2015 USD ($) | Sep. 30, 2015 USD ($) Business Client_List | Jun. 30, 2015 USD ($) Business Client_List | Mar. 31, 2015 USD ($) Business Client_List | Sep. 30, 2015 USD ($)
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Contingent consideration |  | $ 4.2 |  |  | $ 4.2
Model Consulting, Inc [Member] |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Consideration paid in cash |  |  |  | $ 5.5 |
Number of businesses acquired | Business |  |  |  | 1 |
Contingent consideration |  |  |  | $ 4.2 |
Annual revenue | $ 4.2 |  |  |  |
Acquired entity, name | Model Consulting, Inc |  |  |  |
Effective date of acquisition |  |  |  |  | Mar. 01, 2015
Acquisition of Client Lists [Member] |  |  |  |  |
Business Acquisition, Contingent Consideration [Line Items] |  |  |  |  |
Consideration paid in cash |  | $ 0.2 | $ 3.0 | 0.1 |
Number of businesses acquired | Business |  | 0 | 0 |  |
Guaranteed future consideration |  | $ 0.5 |  | $ 0.3 | $ 0.5
Acquisition of Client Lists [Member] | 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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