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Foreign Subsidiaries Income Tax Years Open to Examination (Detail)
12 Months Ended
Dec. 31, 2012
Israel | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2009
Israel | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012
Nicaragua | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2009
Nicaragua | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012
Kenya | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2000
Kenya | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012
Guatemala | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2008
Guatemala | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012
Philippines | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2008
Philippines | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012
New Zealand | Minimum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2008
New Zealand | Maximum
 
Income Tax Examination [Line Items]  
Income tax examination, years open for examination 2012