Summary of Changes in Financial Liabilities Measured at Fair Value for Which Level III Inputs Were Used (Detail) - Level 3 $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($)	[1]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	$ 6,797,104
Transfer Out Due to Deconsolidation	(4,430,339)
Transfer Out Due to Amended CLO Guidance	(2,366,765)	[2]
Collateralized Loan Obligations Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	6,448,352
Transfer Out Due to Deconsolidation	(4,168,405)
Transfer Out Due to Amended CLO Guidance	(2,279,947)	[2]
Collateralized Loan Obligations Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance, Beginning of Period	348,752
Transfer Out Due to Deconsolidation	(261,934)
Transfer Out Due to Amended CLO Guidance	$ (86,818)	[2]

[1] There were no Level III financial liabilities as of and for the three months ended March 31, 2016. There were no changes in unrealized (gains) losses included in earnings related to liabilities still held at either March 31, 2016 or March 31, 2015.

[2] Transfers out due to amended CLO measurement guidance represents the transfer out of Level III for liabilities of consolidated CLO vehicles for which fair value is based on the more observable fair value of CLO assets. Such liabilities are classified as Level II within the fair value hierarchy.