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Composition of the assets of the pension and benefit restoration plan (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 656,131 $ 579,523
Investment Type [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 656,124 579,427
Master Trust [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 657,451 631,916
Defined Benefit Plan Pension And Restoration Plans Interest Amount In Net Assets Of Master Trust 649,702 574,673
Popular Inc Common Stock [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 5,708 3,817
Private Equity Investment [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets 714 937
Cash and Cash Equivalents [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Fair Value of Plan Assets $ 7 $ 96