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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance			$ 986,693
Other comprehensive income before reclassifications	$ (19,331)	$ 8,594	(22,615)	$ (29,051)
Amounts reclassified from AOCI	798	836	2,543	2,448
Net current-period other comprehensive income	(18,533)	9,430	(20,072)	(26,603)
Ending Balance	1,057,296		1,057,296
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(110,367)	(141,682)	(107,083)	(104,037)
Other comprehensive income before reclassifications	(19,331)	8,594	(22,615)	(29,051)
Net current-period other comprehensive income	(19,331)	8,594	(22,615)	(29,051)
Ending Balance	(129,698)	(133,088)	(129,698)	(133,088)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(28,111)	(30,589)	(29,861)	(32,205)
Amounts reclassified from AOCI	800	839	2,550	2,455
Net current-period other comprehensive income	800	839	2,550	2,455
Ending Balance	(27,311)	(29,750)	(27,311)	(29,750)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	58	68	63	72
Amounts reclassified from AOCI	(2)	(3)	(7)	(7)
Net current-period other comprehensive income	(2)	(3)	(7)	(7)
Ending Balance	56	65	56	65
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(138,420)	(172,203)	(136,881)	(136,170)
Ending Balance	$ (156,953)	$ (162,773)	$ (156,953)	$ (162,773)