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Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | $ 971 |
Unvested fair value event dependent | 9,244 |
Total unamortized value | 10,215 | $ 1,200
4th quarter 2015 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 169 |
1st quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 164 |
2nd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 131 |
3rd quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 131 |
4th quarter 2016 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 131 |
1st quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 95 |
2nd quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 39 |
3rd quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 39 |
4th quarter 2017 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | 39 |
1st quarter 2018 [Member] |  |
Amortization Expense [Line Items] |  |
Unvested fair value subject to vesting schedule | $ 33 |

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