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Schedule of Earning Before Income Taxes Derived from United States and Non-U.S Operation (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Mar. 31, 2017
Schedule Of Components Of Income Before Income Tax Expense Benefit [Line Items]
Earnings before income taxes, Non-U.S		$ (5,137)
Earnings before income taxes, United States		(31,550)
Total pre-tax amounts		$ (36,687)
Predecessor
Schedule Of Components Of Income Before Income Tax Expense Benefit [Line Items]
Earnings before income taxes, Non-U.S	$ (1,603,788)		$ (498,931)
Earnings before income taxes, United States	(44,355)		(144,683)
Total pre-tax amounts	$ (1,648,143)		$ (643,614)

X

- Definition

Sum of operating profit and nonoperating income (expense) before income taxes.

+ References

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- Definition

Schedule of Components of Income Before Income Tax Expense (Benefit) [Line Items]

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X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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