Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (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]
Beginning Balance			$ 986,693
Other comprehensive income before reclassifications	$ 15,149	$ 3,537	(3,284)	$ (37,645)
Amounts reclassified from AOCI	873	806	1,745	1,612
Net current-period other comprehensive income	16,022	4,343	(1,539)	(36,033)
Ending Balance	1,048,801		1,048,801
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(125,516)	(145,219)	(107,083)	(104,037)
Other comprehensive income before reclassifications	15,149	3,537	(3,284)	(37,645)
Net current-period other comprehensive income	15,149	3,537	(3,284)	(37,645)
Ending Balance	(110,367)	(141,682)	(110,367)	(141,682)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(28,987)	(31,397)	(29,861)	(32,205)
Amounts reclassified from AOCI	876	808	1,750	1,616
Net current-period other comprehensive income	876	808	1,750	1,616
Ending Balance	(28,111)	(30,589)	(28,111)	(30,589)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	61	70	63	72
Amounts reclassified from AOCI	(3)	(2)	(5)	(4)
Net current-period other comprehensive income	(3)	(2)	(5)	(4)
Ending Balance	58	68	58	68
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(154,442)	(176,546)	(136,881)	(136,170)
Ending Balance	$ (138,420)	$ (172,203)	$ (138,420)	$ (172,203)