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Capital Stock and Derivative Instruments - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | $ 747 |
Unamortized fair-value - event dependent | 4,764 |
Total unamortized dollar value | 5,511 | $ 3,500
3rd quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 109 |
4th quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 109 |
1st quarter 2019 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 103 |
2nd quarter 2019 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 73 |
3rd quarter 2019 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 72 |
4th quarter 2019 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 72 |
1st quarter 2020 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 67 |
2nd quarter 2020 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 37 |
3rd quarter 2020 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 37 |
4th quarter 2020 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 37 |
1st quarter 2021 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | $ 31 |

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