Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Service cost	$ 35	$ 31	$ 26
Interest cost	28	37	54
Expected return on plan assets	(12)	(15)	(16)
Curtailments	0	0	95
Settlements	0	21	0
Amortization of prior service cost	38	36	67
Amortization of plan loss	41	38	17
Net periodic pension benefit cost	$ 130	$ 148	$ 243