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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