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Discontinued Operations and Divestitures - Additional Information (Detail) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) Business | Sep. 30, 2018 USD ($) Business | Dec. 31, 2015 Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of businesses sold | Business | 0 | 0 |
Financial Services [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of businesses sold | Business |  |  | 2
Financial Services Practice Group [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain from the sale of its individual wealth management business | $ | $ 0.4 |  |
Benefits and Insurance Services Practice Group [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Gain from the sale of its individual wealth management business | $ |  | $ 0.7 |

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