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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items]      
Litigation Settlement, Amount Awarded from Other Party   $ 995,000  
Gain Contingency, Unrecorded Amount $ 1,400,000    
CITIGROUP GLOBAL MARKETS [Member]      
Loss Contingencies [Line Items]      
Gain Contingency, Unrecorded Amount 285,000    
Other Party [Domain]      
Loss Contingencies [Line Items]      
Gain Contingency, Unrecorded Amount 2,550    
Successor [Member]      
Loss Contingencies [Line Items]      
Operating Leases, Rent Expense 2,717 $ 3,008 $ 5,746
Operating Leases, Future Minimum Payments Due, Next Twelve Months 6,794    
Operating Leases, Future Minimum Payments, Due in Two Years 5,563    
Operating Leases, Future Minimum Payments, Due in Three Years 1,929    
Operating Leases, Future Minimum Payments, Due in Four Years 1,566    
Operating Leases, Future Minimum Payments, Due in Five Years 1,569    
Operating Leases, Future Minimum Payments, Due Thereafter 11,765    
Operating Leases, Future Minimum Payments Due 29,186    
Minimum [Member]      
Loss Contingencies [Line Items]      
Loan from Commonwealth of Puerto Rico to PREPA 550,000    
Maximum [Member]      
Loss Contingencies [Line Items]      
Loan from Commonwealth of Puerto Rico to PREPA 1,300,000    
Amended Amount [Domain]      
Loss Contingencies [Line Items]      
Loan from Commonwealth of Puerto Rico to PREPA 1,000,000    
Final Amount [Domain]      
Loss Contingencies [Line Items]      
Loan from Commonwealth of Puerto Rico to PREPA $ 300,000