Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	12 Months Ended
	Jul. 31, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Current, Federal, Income tax expense (benefit)	$ (822)	$ 11	$ 649	$ 962
Deferred, Federal, Income tax expense (benefit)	(5,543)		672	531
Federal, Income tax expense (benefit)	(6,365)	11	1,321	1,493
Current, State, Income tax expense (benefit)	3	0	0	0
Deferred, State, Income tax expense (benefit)	0	0	0	250
State, Income tax expense (benefit)	3	0	0	250
Current, Non-U.S., Income tax expense (benefit)	5,128	2,028	26,403	16,718
Deferred, Non-U.S., Income tax expense (benefit)				(209)
Non-U.S., Income tax expense (benefit)	5,128	2,028	26,403	16,509
Current, Total, Income tax expense (benefit)	4,309	2,039	27,052	17,680
Deferred, Total, Income tax expense (benefit)	(5,543)		672	572
Income tax expense (benefit), Total	$ (1,234)	$ 2,039	$ 27,724	$ 18,252