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Capital Stock and Derivative Instruments - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | $ 641 |  |
Unamortized fair-value - event dependent | 7,086 |  |
Total unamortized dollar value | 7,727 | $ 10,000 | $ 1,200
1st quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 140 |  |
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 | 78 |  |
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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