Annual report pursuant to Section 13 and 15(d)

Income Tax - Summary of Years Open to Examination under Different Jurisdiction (Detail)

v2.4.0.8
Income Tax - Summary of Years Open to Examination under Different Jurisdiction (Detail)
 12 Months Ended
Dec. 31, 2013
Minimum [Member] | Canada [Member]
  
Income Tax Examination [Line Items]  
Years open to examination 2009
Minimum [Member] | US [Member]
  
Income Tax Examination [Line Items]  
Years open to examination 2010
Maximum [Member] | Canada [Member]
  
Income Tax Examination [Line Items]  
Years open to examination 2013
Maximum [Member] | US [Member]
  
Income Tax Examination [Line Items]  
Years open to examination 2013