Summary of Significant Accounting Policies - Summary of Credit Loss Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Balance at beginning of the year	$ 8,726
Cumulative effect of change in accounting principle		$ 8,399
Provision for credit loss	41,710	3,255
Expected credit losses related to financial instruments sold or repaid	(1,909)	(2,928)
Balance at end of year	$ 48,527	$ 8,726