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Capital Stock and Derivative Instruments - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | $ 500 |
Unamortized fair-value - event dependent | 6,629 |
Total unamortized dollar value | 7,129 | $ 7,700
2nd quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 84 |
3rd quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 84 |
4th quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 84 |
1st quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 77 |
2nd quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 45 |
3rd quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 44 |
4th quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 44 |
1st quarter 2019 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | $ 38 |

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