Summary of Tax Effects of Temporary Differences (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets
Fund Management Fees	$ 6,955	$ 9,938
Equity-Based Compensation	69,484	54,699
Amortization and Depreciation	768,984	754,924
Net Operating Loss Carry Forward		8,885
Total Deferred Tax Assets	845,423	828,446
Deferred Tax Liabilities
Unrealized Gains from Investments	71,472	65,883
Other	34,469	36,593
Total Deferred Tax Liabilities	105,941	102,476
Net Deferred Tax Assets	$ 739,482	$ 725,970