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Discontinued Operations and Divestitures - Additional Information (Detail) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 Office | Dec. 31, 2015 USD ($) Business | Dec. 31, 2014 USD ($) Business | Dec. 31, 2013 USD ($) | Aug. 30, 2013 USD ($) | Jul. 26, 2013 USD ($)
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 |  | $ 0.1 | $ 0.1 | $ 0.1 |  |
Number of business divestiture | Office | 2 |  |  |  |  |
MMP [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Aggregate Purchase price consideration paid during transaction |  |  |  |  | $ 201.6 | $ 201.6
Amount related to credit facility debt |  |  |  | $ 40.0 |  |
Financial Services [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of businesses sold | Business |  | 2 |  |  |  |
Aggregate Purchase price consideration paid during transaction |  | $ 2.7 |  |  |  |
Gain from the sale of its individual wealth management business |  | $ 1.4 |  |  |  |
Financial Services Practice Group [Member] |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Number of businesses sold | Business |  | 3 | 1 |  |  |
Gain from the sale of its individual wealth management business |  |  | $ 1.2 |  |  |
Sale of business |  | $ 0.5 | $ 2.9 |  |  |

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