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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | $ 802 |  |
Unamortized fair-value - event dependent | 9,209 |  |
Total unamortized value | 10,011 | $ 1,200 | $ 700
1st quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 164 |  |
2nd quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 131 |  |
3rd quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 131 |  |
4th quarter 2016 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 131 |  |
1st quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 95 |  |
2nd quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 39 |  |
3rd quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 39 |  |
4th quarter 2017 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | 39 |  |
1st quarter 2018 [Member] |  |  |
Amortization Expense [Line Items] |  |  |
Unamortized fair value subject to vesting schedule | $ 33 |  |

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