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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 |  |

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