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Schedule of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jul. 31, 2017
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Reconciliation Of Provision Of Income Taxes [Line Items]                
Current, Federal, Income tax expense (benefit)       $ 11        
Federal, Income tax expense (benefit)       11        
Current, State, Income tax expense (benefit)       0        
Deferred, State, Income tax expense (benefit)       0        
State, Income tax expense (benefit)       0        
Current, International, Income tax expense (benefit)       2,028        
International, Income tax expense (benefit)       2,028        
Current, Total, Income tax expense (benefit)       2,039        
Income tax expense (benefit), Total $ 5,797     $ 2,039 $ 9,118      
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)     $ (7,743)   (2,200)
Income tax expense (benefit), Total   $ 295 $ (1,234)     $ 2,012 $ 4,680 $ 6,397