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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,021,944
Balance	985,481
Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 1,747,564
Balance		1,651,059
Available for Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	256
Gains/(losses) recognized in OCI	(660)
Reclasses from OCI to net income	361
Net period OCI	(299)
Balance	(43)
Available for Sale Securities | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(1)
Gains/(losses) recognized in OCI		(215)
Reclasses from OCI to net income		121
Net period OCI		(94)
Balance		(95)
Currency Translation Adjustment | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(9,811)
Gains/(losses) recognized in OCI		0
Reclasses from OCI to net income		0
Net period OCI		0
Balance		(9,811)
Pension/Post-retirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(403)
Gains/(losses) recognized in OCI	0
Reclasses from OCI to net income	0
Net period OCI	0
Balance	(403)
Pension/Post-retirement Benefits | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		4,683
Gains/(losses) recognized in OCI		(5,121)
Net period OCI		(5,121)
Balance		(438)
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
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(147)
Gains/(losses) recognized in OCI	(660)
Reclasses from OCI to net income	361
Net period OCI	(299)
Balance	$ (446)
Accumulated other comprehensive loss | Predecessor
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(6,446)
Gains/(losses) recognized in OCI		(5,336)
Reclasses from OCI to net income		1,438
Net period OCI		(3,898)
Balance		$ (10,344)

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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