SEGMENT REPORTING - Adjusted Net Income (Additional Information) (Detail) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segment	Jun. 30, 2015 USD ($)
Segment Reporting, Asset Reconciling Item [Line Items]
Number of segments | segment			1
Investment Management
Segment Reporting, Asset Reconciling Item [Line Items]
Placement costs		$ 2.8		$ 3.7
Interest income	$ 1.6	$ 1.2	$ 2.9	$ 2.2