Contingencies - Additional Information (Detail)	12 Months Ended		24 Months Ended
	Dec. 31, 2009 interest_plan	Dec. 31, 2008 interest_plan	Dec. 31, 2009 interest_plan	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Number of carried interest plans | interest_plan	1	1	2
Carried interest rate (as a percent)			15.00%
Plan investment deployed amount				$ 0	$ 0
Maximum
Loss Contingencies [Line Items]
Plan investment deployed amount				$ 77,000,000