Capital Stock - Schedule of Unamortized Value of Restricted Stock (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Amortization Expense [Line Items]
Unamortized fair value subject to vesting schedule	$ 638
Unamortized fair-value - event dependent	8,320
Total unamortized value	8,958	$ 10,000
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