Income Taxes (Summary of Tax Provision Allocation to Financial Statement Items) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 52,098	$ 31,406	$ 14,447
Stockholders' equity, unrealized gain (loss) on investment securities & foreign currency	66	14	75
Total Income Tax Expense	$ 52,164	$ 31,420	$ 14,522