Summary of Significant Jurisdictions Currently Under Audit (Detail)	9 Months Ended
	Sep. 30, 2012
Canada [Member]
Significant Tax Jurisdictions Currently Under Audit [Line Items]
Significant tax jurisdictions currently under audit	2003 to 2009
Philippines [Member]
Significant Tax Jurisdictions Currently Under Audit [Line Items]
Significant tax jurisdictions currently under audit	2007 to 2010
United States [Member]
Significant Tax Jurisdictions Currently Under Audit [Line Items]
Significant tax jurisdictions currently under audit	2010