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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2018
Loss Contingencies [Line Items] |  |  |  |
Operating Leases, Rent Expense | $ 2,466 | $ 2,717 | $ 3,008 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | 5,651 |  |  |
Litigation Settlement, Amount Awarded from Other Party |  |  | $ 995,000 |
Operating Leases, Future Minimum Payments, Due in Two Years | 2,101 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | 1,562 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | 1,565 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years | 1,568 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | 10,167 |  |  |
Operating Leases, Future Minimum Payments Due | 22,614 |  |  |
Gain Contingency, Unrecorded Amount |  |  |  | $ 1,400,000
Citigroup [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Gain Contingency, Unrecorded Amount | 285,000 |  |  |
Goldman Sachs [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Gain Contingency, Unrecorded Amount | 272,000 |  |  |
Proceeds from Legal Settlements | 26,721 |  |  |
Other Party [Domain] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Gain Contingency, Unrecorded Amount | $ 2,550 |  |  |

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