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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 1,057,084	$ 1,144,923	$ 1,021,944
Balance	$ 1,057,084	1,021,944	1,016,410	1,144,923
Pension Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(438)	(3,036)	2,194	(403)
Gains/(losses) recognized in OCI	(2,598)	(403)	(2,430)	4,133
Reclasses from OCI to net income				(1,536)
Net period OCI	(2,598)	(403)	(2,430)	2,597
Balance	(3,036)	(403)	(236)	2,194
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(95)	68		256
Gains/(losses) recognized in OCI	57	87		(660)
Reclasses from OCI to net income	106	169		404
Net period OCI	163	256		(256)
Balance	68	256
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,344)	(12,779)	2,194	(147)
Gains/(losses) recognized in OCI	(2,541)	(316)		3,473
Reclasses from OCI to net income	106	169		(1,132)
Net period OCI	(2,435)	(147)		2,341
Balance	(12,779)	(147)	$ (236)	$ 2,194
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,811)	$ (9,811)
Balance	$ (9,811)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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