Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (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			$ 891,783
Other comprehensive income before reclassifications	$ 8,594	$ (19,255)	(29,051)	$ (11,251)
Amounts reclassified from AOCI	836	471	2,448	1,552
Remeasurement adjustment related to the Tax Act (1)				(5,325)
Net current-period other comprehensive income	9,430	(18,784)	(26,603)	(15,024)
Ending Balance	938,193		938,193
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(141,682)	(100,477)	(104,037)	(108,481)
Other comprehensive income before reclassifications	8,594	(19,255)	(29,051)	(11,251)
Net current-period other comprehensive income	8,594	(19,255)	(29,051)	(11,251)
Ending Balance	(133,088)	(119,732)	(133,088)	(119,732)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(30,589)	(37,323)	(32,205)	(33,083)
Amounts reclassified from AOCI	839	473	2,455	1,558
Remeasurement adjustment related to the Tax Act (1)				(5,325)
Net current-period other comprehensive income	839	473	2,455	(3,767)
Ending Balance	(29,750)	(36,850)	(29,750)	(36,850)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	68	77	72	81
Amounts reclassified from AOCI	(3)	(2)	(7)	(6)
Net current-period other comprehensive income	(3)	(2)	(7)	(6)
Ending Balance	65	75	65	75
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(172,203)	(137,723)	(136,170)	(141,483)
Ending Balance	$ (162,773)	$ (156,507)	$ (162,773)	$ (156,507)