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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			$ 1,021,944
Balance	$ 975,526		975,526
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				$ 1,747,564
Balance		$ 1,125,830		1,125,830
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(43)		256
Gains/(losses) recognized in OCI			(660)
Reclasses from OCI to net income	43		404
Net period OCI	43		(256)
Balance	0		0
Available for Sale Securities | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(95)		(1)
Gains/(losses) recognized in OCI		6		(209)
Reclasses from OCI to net income		80		201
Net period OCI		86		(8)
Balance		(9)		(9)
Pension/Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(403)		(403)
Gains/(losses) recognized in OCI	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		0		(5,121)
Reclasses from OCI to net income		0
Net period OCI		0		(5,121)
Balance		(438)		(438)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(446)		(147)
Gains/(losses) recognized in OCI			(660)
Reclasses from OCI to net income	43		404
Net period OCI	43		(256)
Balance	$ (403)		$ (403)
Accumulated other comprehensive loss | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(10,344)		(6,446)
Gains/(losses) recognized in OCI		6		(5,330)
Reclasses from OCI to net income		80		1,518
Net period OCI		86		(3,812)
Balance		(10,258)		(10,258)
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)
Gains/(losses) recognized in OCI				0
Reclasses from OCI to net income				1,317
Net period OCI				1,317
Balance		$ 0		$ 0

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

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