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Gross Amount of Goodwill and Accumulated Impairment Losses by Reportable Segment and Corporate Group (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Dec. 31, 2009
Goodwill [Line Items]    
Goodwill (gross amounts)$ 812,764$ 811,798$ 810,355$ 768,943
Accumulated impairment losses164,411164,411164,411164,594
Goodwill (net amounts)648,353647,387645,944604,349
Banco Popular De Puerto Rico [Member]
    
Goodwill [Line Items]    
Goodwill (gross amounts)246,275245,309243,866157,025
Accumulated impairment losses0000
Goodwill (net amounts)246,275245,309243,866157,025
Banco Popular North America [Member]
    
Goodwill [Line Items]    
Goodwill (gross amounts)566,489566,489566,489566,489
Accumulated impairment losses164,411164,411164,411164,411
Goodwill (net amounts)402,078402,078402,078402,078
Corporate [Member]
    
Goodwill [Line Items]    
Goodwill (gross amounts)00045,429
Accumulated impairment losses000183
Goodwill (net amounts)$ 0$ 0$ 0$ 45,246