Accumulated Other Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Losses) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (87,977)	$ (133,736)	$ (77,896)	$ (137,440)
Other comprehensive income (loss) before reclassifications (net of tax)	16,351	(11,028)	9,138	(5,751)
Amounts reclassified from accumulated other comprehensive income (net of tax)	(1,080)	(863)	(3,948)	(2,436)
Net current period other comprehensive income (loss)	15,271	(11,891)	5,190	(8,187)
Ending Balance	(72,706)	(145,627)	(72,706)	(145,627)
Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(84,358)	(73,001)	(76,346)	(69,622)
Other comprehensive income (loss) before reclassifications (net of tax)	17,836	(17,073)	9,824	(20,452)
Net current period other comprehensive income (loss)	17,836	(17,073)	9,824	(20,452)
Ending Balance	(66,522)	(90,074)	(66,522)	(90,074)
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,447	4,442	4,316	2,199
Other comprehensive income (loss) before reclassifications (net of tax)	(1,850)	3,596	(1,051)	7,326
Amounts reclassified from accumulated other comprehensive income (net of tax)	(985)	(1,231)	(3,653)	(2,718)
Net current period other comprehensive income (loss)	(2,835)	2,365	(4,704)	4,608
Ending Balance	(388)	6,807	(388)	6,807
Change in Pensions [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(6,956)	(66,325)	(7,253)	(71,431)
Other comprehensive income (loss) before reclassifications (net of tax)	365	2,449	365	7,375
Amounts reclassified from accumulated other comprehensive income (net of tax)	153	592	450	772
Net current period other comprehensive income (loss)	518	3,041	815	8,147
Ending Balance	(6,438)	(63,284)	(6,438)	(63,284)
Change in Other Postretirement Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	890	1,148	1,387	1,414
Amounts reclassified from accumulated other comprehensive income (net of tax)	(248)	(224)	(745)	(490)
Net current period other comprehensive income (loss)	(248)	(224)	(745)	(490)
Ending Balance	$ 642	$ 924	$ 642	$ 924