Income Taxes - Schedule of Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Income Tax Assets:
Tax goodwill	$ 176,244	$ 234,437
Net operating loss	86,644	96,524
Investments in partnerships	41,865	19,607
Tax credit carryforwards	15,160	15,550
Employee compensation	1,183	1,027
Deferred Tax Assets, Other	1,624	869
Deferred Income Tax Assets	322,720	368,014
Valuation allowance	(11,083)	(11,959)	$ (12,028)	$ (7,798)
Total Deferred Income Tax Assets	311,637	356,055
Deferred Income Tax Liabilities:
Total Deferred Income Tax Liabilities	$ 1,080	$ 1,030