Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax asset
Basis difference of investments	$ 54,445	$ 55,847
Deferred compensation	153,978	114,758
Other deferred and accrued expenses	7,655	9,600
Net Operating loss and credit carry-forwards	4,216	1,297
Total deferred tax asset	220,294	181,502
Valuation Allowance	(3,973)	(1,297)
Deferred tax asset, net of allowance	216,321	180,205
Deferred tax liability
Depreciation and amortization	30,156	19,518
Other	3,384	10,749
Deferred tax liability	33,540	30,267
Net deferred tax asset	$ 182,781	$ 149,938