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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (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	$ 891,783
Other comprehensive income before reclassifications	(4,042)	$ 8,556	$ (45,000)
Amounts reclassified from AOCI	3,331	2,082	3,080
Remeasurement adjustment related to the Tax Act		(5,325)
Net current period other comprehensive income	(711)	5,313	(41,920)
Ending Balance	986,693	891,783
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(104,037)	(108,481)	(70,561)
Other comprehensive income before reclassifications	(3,046)	4,444	(37,920)
Net current period other comprehensive income	(3,046)	4,444	(37,920)
Ending Balance	(107,083)	(104,037)	(108,481)
Defined Benefit Pension Plan Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(32,205)	(33,083)	(29,093)
Other comprehensive income before reclassifications	(996)	4,112	(7,080)
Amounts reclassified from AOCI	3,340	2,091	3,090
Remeasurement adjustment related to the Tax Act		(5,325)
Net current period other comprehensive income	2,344	878	(3,990)
Ending Balance	(29,861)	(32,205)	(33,083)
Cash Flow Hedge Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	72	81	91
Amounts reclassified from AOCI	(9)	(9)	(10)
Net current period other comprehensive income	(9)	(9)	(10)
Ending Balance	63	72	81
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(136,170)	(141,483)	(99,563)
Ending Balance	$ (136,881)	$ (136,170)	$ (141,483)

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