Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (77,896)	$ (137,440)	$ (140,675)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Balance as adjusted at January 1, 2018			$ (162,973)
Other comprehensive income (loss) before reclassifications (net of tax)	23,901	9,632	(31,430)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(4,658)	49,912	56,963
Net current period other comprehensive income (loss)	19,243	59,544	25,533
Ending Balance	(58,653)	(77,896)	(137,440)
Revision of Prior Period, Reclassification, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(22,298)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(76,346)	(69,622)	$ (41,839)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Balance as adjusted at January 1, 2018			$ (41,839)
Other comprehensive income (loss) before reclassifications (net of tax)	33,821	(6,724)	(27,783)
Net current period other comprehensive income (loss)	33,821	(6,724)	(27,783)
Ending Balance	(42,525)	(76,346)	(69,622)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	4,316	2,199	$ (4,092)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Balance as adjusted at January 1, 2018			$ (4,092)
Other comprehensive income (loss) before reclassifications (net of tax)	(2,840)	6,800	2,641
Amounts reclassified from accumulated other comprehensive income (net of tax)	(3,972)	(4,683)	3,650
Net current period other comprehensive income (loss)	(6,812)	2,117	6,291
Ending Balance	(2,496)	4,316	2,199
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(7,253)	(71,431)	$ (98,295)
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Balance as adjusted at January 1, 2018			$ (121,592)
Other comprehensive income (loss) before reclassifications (net of tax)	(6,202)	8,730	(9,267)
Amounts reclassified from accumulated other comprehensive income (net of tax)	611	55,448	59,428
Net current period other comprehensive income (loss)	(5,591)	64,178	50,161
Ending Balance	(12,844)	(7,253)	(71,431)
Change in Pensions [Member] | Revision of Prior Period, Reclassification, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(23,297)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1,387	1,414	$ 3,551
Accounting Standards Update [Extensible List]			us-gaap:AccountingStandardsUpdate201802Member
Balance as adjusted at January 1, 2018			$ 4,550
Other comprehensive income (loss) before reclassifications (net of tax)	(878)	826	2,979
Amounts reclassified from accumulated other comprehensive income (net of tax)	(1,297)	(853)	(6,115)
Net current period other comprehensive income (loss)	(2,175)	(27)	(3,136)
Ending Balance	$ (788)	$ 1,387	1,414
Change in Other Postretirement Defined Benefit Plans [Member] | Revision of Prior Period, Reclassification, Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 999