XML 174 R154.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Subsequent Events - Additional Information (Detail) |  |  |  | 2 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 07, 2018 USD ($) $ / shares | Feb. 02, 2018 USD ($) | Jul. 31, 2017 USD ($) | Feb. 28, 2018 USD ($) Kz / $ | Dec. 31, 2017 Kz / $
Subsequent Event [Line Items] |  |  |  |  |
Aggregate principal amount |  |  | $ 350,000,000 |  |
Debt instrument maturity year |  |  | 2022 |  |
Offer | Predecessor |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Debt instrument repurchase period |  |  | 60 days |  |
Offer | Minimum | Predecessor |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Net proceeds realized from asset sales exceed amount |  |  | $ 10,000,000 |  |
Subsequent Event | Tendered Notes |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Aggregate principal amount | $ 46,023 |  |  |  |
Consideration received by holders from principal amount of per notes | $ / shares | $ 1.00 |  |  |  |
Consideration received by holders from principal amount of notes | $ 1.00 |  |  |  |
Cash equal to difference between offer amount and principal amount | $ 24,700,000 |  |  |  |
Subsequent Event | Offer | Senior Secured Notes |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Debt instrument fixed interest rate |  | 8.00% |  |  |
Debt instrument maturity year |  | 2022 |  |  |
Debt instrument maturity date |  | Mar. 06, 2018 |  |  |
Subsequent Event | Offer | Senior Secured Notes | Maximum |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Aggregate principal amount |  | $ 24,700,276 |  |  |
Devaluation Of Angolan kwanza Versus US Dollar |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Foreign currency exchange rate | Kz / $ |  |  |  |  | 168
Devaluation Of Angolan kwanza Versus US Dollar | Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Foreign currency exchange rate | Kz / $ |  |  |  | 213 |
Percentage of devaluation of currency |  |  |  | 27.00% |
Estimated exchange loss |  |  |  | $ 14,000 |
Percentage of foreign exchange loss recognized |  |  |  | 49.00% |
Devaluation Of Angolan kwanza Versus US Dollar | Subsequent Event | Sonatide joint venture |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Estimated exchange loss |  |  |  | $ 28,000,000 |

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