Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Mar. 31, 2017
Reconciliation Of Provision Of Income Taxes [Line Items]
Current, Federal, Income tax expense (benefit)		$ 11		$ 962
Deferred, Federal, Income tax expense (benefit)				531
Federal, Income tax expense (benefit)		11		1,493
Current, State, Income tax expense (benefit)		0		0
Deferred, State, Income tax expense (benefit)		0		250
State, Income tax expense (benefit)		0		250
Current, International, Income tax expense (benefit)		2,028		16,718
Deferred, International, Income tax expense (benefit)				(209)
International, Income tax expense (benefit)		2,028		16,509
Current, Total, Income tax expense (benefit)		2,039		17,680
Deferred, Total, Income tax expense (benefit)				572
Income tax expense (benefit), Total		$ 2,039		$ 18,252
Predecessor
Reconciliation Of Provision Of Income Taxes [Line Items]
Current, Federal, Income tax expense (benefit)	$ (822)				$ (842)
Deferred, Federal, Income tax expense (benefit)	(5,543)				(2,200)
Federal, Income tax expense (benefit)	(6,365)				(3,042)
Current, State, Income tax expense (benefit)	3				17
Deferred, State, Income tax expense (benefit)	0				0
State, Income tax expense (benefit)	3				17
Current, International, Income tax expense (benefit)	5,128				9,422
International, Income tax expense (benefit)	5,128				9,422
Current, Total, Income tax expense (benefit)	4,309				8,597
Deferred, Total, Income tax expense (benefit)	(5,543)				(2,200)
Income tax expense (benefit), Total	$ (1,234)		$ 4,680		$ 6,397