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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]            
Expected tax rate     28.00%      
Effective tax rate 61.00% 17.00%   15.00%    
Foreign tax credit carryforwards expire amount           $ 2,835
U.S. foreign tax credit carryforwards expiration     2023      
Scenario, Forecast [Member]            
Operating Loss Carryforwards [Line Items]            
Effective tax rate         37.00%  
NOL Carryforward [Member] | Internal Revenue Service (IRS) [Member]            
Operating Loss Carryforwards [Line Items]            
Net operating loss (NOL) carryforwards           $ 4,853
NOL carryforwards expiration year, start           2019
NOL carryforwards expiration year, end           2027
NOL carryforwards, valuation allowances           $ 133
NOL Carryforward [Member] | Canada Revenue Agency [Member]            
Operating Loss Carryforwards [Line Items]            
Net operating loss (NOL) carryforwards           $ 28,691
NOL carryforwards expiration year, start           2027
NOL carryforwards expiration year, end           2035
NOL carryforwards, valuation allowances           $ 7,379
Other Carryforwards [Member] | Canada Revenue Agency [Member]            
Operating Loss Carryforwards [Line Items]            
Other deductible carryforwards           21,682
Other deductible carryforwards, valuation allowances           4,184
Foreign Tax Authority [Member]            
Operating Loss Carryforwards [Line Items]            
Deferred tax assets, valuation allowance           2,023
Foreign Tax Authority [Member] | NOL Carryforward [Member]            
Operating Loss Carryforwards [Line Items]            
Net operating loss (NOL) carryforwards           3,850
Foreign Tax Authority [Member] | Other Carryforwards [Member]            
Operating Loss Carryforwards [Line Items]            
Other deductible carryforwards           $ 2,846
Other deductible carryforwards expiration year, start           2016
Other deductible carryforwards expiration year, end           2021