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SEGMENT REPORTING - Adjusted Net Income (Additional Information) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Investment Management        
Segment Reporting, Asset Reconciling Item [Line Items]        
Interest income $ 1.2 $ 0.7 $ 2.2 $ 1.8