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Acquisitions (First Quarter 2015) - Additional Information (Detail) - Model Consulting, Inc [Member] - USD ($) $ in Millions |  | 12 Months Ended
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Mar. 01, 2015 | Dec. 31, 2015
Business Acquisition, Contingent Consideration [Line Items] |  |
Annual revenue | $ 4.2 |
Acquired entity, name | Model Consulting, Inc |
Effective date of acquisition |  | Mar. 01, 2015

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