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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Jul. 31, 2017	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					$ 1,021,944
Balance	$ 1,057,084	$ 1,042,814	$ 943,908	$ 1,057,084	943,908
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				1,747,564
Balance	2,161			2,161
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance					256
Gains/(losses) recognized in OCI		7			(660)
Reclasses from OCI to net income		75			404
Net period OCI		82			(256)
Balance		82	0		0
Available for Sale Securities | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9)			(1)
Gains/(losses) recognized in OCI	51			(158)
Reclasses from OCI to net income	26			227
Net period OCI	77			69
Balance	68			68
Pension/Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(403)		(403)
Gains/(losses) recognized in OCI		0	0		0
Reclasses from OCI to net income			0		0
Net period OCI			0		0
Balance			(403)		(403)
Pension/Post-retirement Benefits | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(438)			4,683
Gains/(losses) recognized in OCI	(2,598)			(7,719)
Reclasses from OCI to net income	0			0
Net period OCI	(2,598)			(7,719)
Balance	(3,036)			(3,036)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(403)		(147)
Gains/(losses) recognized in OCI		7			(660)
Reclasses from OCI to net income		75			404
Net period OCI		82			(256)
Balance		82	$ (403)		$ (403)
Accumulated other comprehensive loss | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(10,258)			(6,446)
Gains/(losses) recognized in OCI	(2,547)			(7,877)
Reclasses from OCI to net income	26			1,544
Net period OCI	(2,521)			(6,333)
Balance	(12,779)			(12,779)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gains/(losses) recognized in OCI		0
Reclasses from OCI to net income		0
Net period OCI		$ 0
Currency Translation Adjustment | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,811)			(9,811)
Gains/(losses) recognized in OCI	0			0
Reclasses from OCI to net income	0			0
Net period OCI	0			0
Balance	$ (9,811)			(9,811)
Interest Rate Swaps | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				(1,317)
Reclasses from OCI to net income				1,317
Net period OCI				$ 1,317

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

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