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Schedule of Tax Rate Applicable to Pre-Tax Earning, U.S. Federal Statutory Rate (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 Statutory Federal Tax Rate [Line Items]                
Computed "expected" tax expense       $ (12,840)        
Foreign income taxed at different rates       1,767        
Uncertain tax positions       (3,219)        
Transition tax       15,120        
Valuation allowance - deferred tax assets       (28,387)        
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions       11        
Foreign taxes       845        
Other, net       1,481        
Remeasurement of deferred taxes       27,261        
Income tax expense (benefit), Total $ 5,797     $ 2,039 $ 9,118      
Predecessor                
Reconciliation Of Statutory Federal Tax Rate [Line Items]                
Computed "expected" tax expense     $ (576,850)         $ (225,265)
Foreign income taxed at different rates     448,805         232,904
Uncertain tax positions     4,674         3,007
Chapter 11 reorganization     50,428          
Nondeductible transaction costs     2,628          
Transition tax               5,587
Valuation allowance - deferred tax assets     69,278         (2,377)
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions     (822)         (3,860)
Foreign taxes     (1,342)         (928)
State taxes     3         11
Other, net     1,964          
Remeasurement of deferred taxes               (2,682)
Income tax expense (benefit), Total   $ 295 $ (1,234)     $ 2,012 $ 4,680 $ 6,397