Intangible Assets - Reconciliation of Intangible Assets (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount at beginning of period			$ 68,322,000	$ 68,322,000
Gross carrying amount at end of period	$ 68,322,000	$ 68,322,000	68,322,000	68,322,000
Accumulated amortization at beginning of period			(45,573,000)	(43,113,000)
Amortization expense	(615,000)	(615,000)	(1,230,000)	(1,230,000)
Accumulated amortization at end of period	(46,803,000)	(44,343,000)	(46,803,000)	(44,343,000)
Net book value at end of period	$ 21,519,000	$ 23,979,000	$ 21,519,000	$ 23,979,000	$ 22,749,000