Stockholders' Equity - Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 866,699	$ 559,617	$ 999,433	$ 681,574
Other comprehensive income (loss) before reclassifications	4,025	22,875	(14,653)	(18,783)
Adjustments for items reclassified to earnings, net of tax	25,037	1,615	26,373	3,510
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	29,062	24,490	11,720	(15,273)
Balance	931,855	683,968	931,855	683,968
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(87,467)	(171,332)	(67,724)	(120,586)
Other comprehensive income (loss) before reclassifications	5,502	22,384	(14,241)	(28,362)
Adjustments for items reclassified to earnings, net of tax	23,579	0	23,579	0
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	29,081	22,384	9,338	(28,362)
Balance	(58,386)	(148,948)	(58,386)	(148,948)
Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(168,243)	(162,081)	(170,644)	(173,064)
Other comprehensive income (loss) before reclassifications	(1,477)	491	(412)	9,579
Adjustments for items reclassified to earnings, net of tax	1,458	1,615	2,794	3,510
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(19)	2,106	2,382	13,089
Balance	(168,262)	(159,975)	(168,262)	(159,975)
AOCI Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1	(1)		(2)
Other comprehensive income (loss) before reclassifications	(1)	(1)
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	(1)	(1)
Balance		(2)		(2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(255,711)	(333,412)	(238,368)	(293,648)
Other comprehensive income (loss) before reclassifications	4,026	22,876	(14,653)	(18,783)
Adjustments for items reclassified to earnings, net of tax	25,037	1,615	26,373	3,510
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	29,063	24,491	11,720	(15,273)
Balance	(226,648)	(308,921)	(226,648)	(308,921)
Total AOCI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(255,710)	(333,413)	(238,368)	(293,650)
Balance	$ (226,648)	$ (308,923)	$ (226,648)	$ (308,923)