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Commitments And Contingencies (Detail) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 20, 2016 USD ($) | Dec. 31, 2016 USD ($) | Jun. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) item | Dec. 31, 2015 USD ($) | Jun. 30, 2016 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Number Monthly Payments | item |  |  |  | 7 |  |
Contractual Obligation Company Share |  |  |  | $ 3,600,000 |  | $ 5,100,000
Abandonment Funding |  |  |  | 5,137,000 | $ 5,137,000 |
Abandonment cost related to annual funding |  |  |  |  | 61,100,000 |
Abandonment cost related to annual funding, net |  |  |  |  | 17,300,000 |
DGH audit settlement |  |  | $ 300,000 |  |  |
Payments for Legal Settlements | $ 775,000 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Abandonment cost related to annual funding |  | $ 9,100,000 |  |  |  |
Abandonment cost related to annual funding, net |  | $ 2,600,000 |  |  |  |
Gabon [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Abandonment Funding |  |  |  |  | 5,100,000 |
Abandonment funding, gross |  |  |  |  | $ 18,300,000 |
Accrued Payroll Taxes |  |  |  | $ 2,200,000 |  |

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