Stockholders' Equity - Adjustments for Items Reclassified From AOCI (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	$ 25,037	$ 1,615	$ 26,373	$ 3,510
Currency Translation Adjustments [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	23,579	0	23,579	0
Employee Benefit Plans [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications, net of tax	1,458	1,615	2,794	3,510
Employee benefit plans:
Amortization relating to employee benefit plans	1,941	1,953	3,658	4,186
Less - related income taxes	$ 483	$ 338	$ 864	$ 676