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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]          
Expected tax rate 14.00% 26.00% 14.00%    
Effective tax rate   26.00%      
Foreign tax credit carryforwards expire amount         $ 3,309
U.S. foreign tax credit carryforwards expiration   2023      
Scenario, Forecast [Member]          
Operating Loss Carryforwards [Line Items]          
Effective tax rate       29.00%  
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