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Discontinued Operations and Divestitures - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($) Business | Dec. 31, 2015 USD ($) Business | Dec. 31, 2014 USD ($)
Financial Services [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of businesses sold | Business |  | 2 |
Aggregate Purchase price consideration paid during transaction |  | $ 2.7 |
Gain from the sale of its individual wealth management business |  | $ 1.4 |
Benefits And Insurance Services Practice Group [Member] |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Number of businesses sold | Business | 2 |  |
Gain from the sale of its individual wealth management business | $ 0.9 |  |
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 |  |  | $ 1.3

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