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Schedule of Tax Rate Applicable to Pre-Tax Earning, U.S. Federal Statutory Rate (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 Statutory Federal Tax Rate [Line Items]          
Computed “expected” tax benefit   $ (12,840)   $ (32,239)  
Foreign income taxed at different rates   1,767   20,917  
Uncertain tax positions   (3,219)   2,264  
Nondeductible transaction costs       1,091  
Transition tax   15,120      
Valuation allowance – deferred tax assets   (28,387)   38,778  
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions   11      
Foreign taxes   845   13,012  
State taxes       246  
Return to accrual   835   (28,176)  
162(m) - Executive compensation       2,818  
Other, net   646   (459)  
Remeasurement of deferred taxes   27,261      
Income tax expense (benefit), Total   $ 2,039   $ 18,252  
Predecessor          
Reconciliation Of Statutory Federal Tax Rate [Line Items]          
Computed “expected” tax benefit $ (576,850)        
Foreign income taxed at different rates 448,805        
Uncertain tax positions 4,674        
Chapter 11 reorganization 50,428        
Nondeductible transaction costs 2,628        
Valuation allowance – deferred tax assets 69,278        
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions (822)        
Foreign taxes (1,342)        
State taxes 3        
Return to accrual 668        
Other, net 1,296        
Income tax expense (benefit), Total $ (1,234)   $ 4,680   $ 6,397