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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | $ 816 |
Unamortized fair-value - event dependent | 8,320 |
Total unamortized dollar value | 9,136 | $ 10,000
4th quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Unamortized fair value subject to vesting schedule | 175 |
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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