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Tax Years Subject to Examination by Major Taxing Jurisdictions (Details)
 12 Months Ended
Dec. 31, 2013
United States | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
United States | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Canada | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
Canada | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Arkansas | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
Arkansas | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
California | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2007
California | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Georgia | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
Georgia | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Idaho | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
Idaho | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Illinois | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2008
Illinois | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011
Wisconsin | Minimum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2007
Wisconsin | Maximum
  
Income Tax Examination [Line Items]  
Income tax examination, year under examination 2011