Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss), tax	$ (505)	$ (676)	$ 23
Foreign currency translation adjustments, tax	0	0	0
Unrealized Gains (Losses) on Marketable Securities, tax	(2,174)	(1,728)	(2,308)
Unrealized (Losses) Gains on Cash Flow Hedges	209	143	(708)
Retirement plans prior service benefit, tax	(1,134)	(1,132)	(1,130)
Foreign Currency Translation Reclassification Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	0	0
Other comprehensive income (loss), tax	0	0
Unrealized (Losses) Gains on Marketable Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	(470)	568
Amounts reclassified from accumulated other comprehensive income (loss), tax	24	12	25
Other comprehensive income (loss), tax	(446)	580
Unrealized (Losses) Gains on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	593	1,537
Amounts reclassified from accumulated other comprehensive income (loss), tax	(527)	(686)
Other comprehensive income (loss), tax	66	851
Retirement Plans Prior Service Credit
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications, tax	0	0
Amounts reclassified from accumulated other comprehensive income (loss), tax	(2)	(2)	$ (2)
Other comprehensive income (loss), tax	$ (2)	$ (2)