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Differences between income tax expense (benefit) applicable to income before income taxes and amount computed by applying the statutory tax rate in Puerto Rico (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract        
Computed income tax at statutory rates   $ 4,400 $ 1,100 $ (8,900)
Income tax (benefit) expense   (26,403) 114,927 108,230
PUERTO RICO
       
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract        
Computed income tax at statutory rates   65,662 79,876 100,586
Net benefit of net tax exempt interest income   (25,540) (31,379) (7,799)
Deferred tax asset valuation allowance   166 7,192 143,754
Non-deductible expenses   23,093 21,756 28,130
Difference in tax rates due to multiple jurisdictions   (6,034) (8,555) 13,908
Adjustment for enacted changes in income tax laws 103,287 0 103,287 0
Unrecognized Tax Benefits Period Increases Decreases   (8,985) (5,160) 0
Income Tax Reconciliation Other Adjustments   3,367 3,377 (26,505)
Income tax (benefit) expense   (26,403) 114,927 108,230
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract        
Computed income tax at statutory rates   30.00% 30.00% 41.00%
Effective Income Tax Rate Reconciliation Tax Exempt Income   (12.00%) (12.00%) (3.00%)
Deferred tax asset valuation allowance   0.00% 3.00% 59.00%
Non-deductible expenses   11.00% 8.00% 11.00%
Difference in tax rates due to multiple jurisdictions   (3.00%) (3.00%) 6.00%
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate   0.00% 39.00% 0.00%
EffectiveIncomeTaxRateReconciliationOtherAdjustments   (4.00%) (2.00%) 0.00%
Income tax (benefit) expense   (12.00%) 43.00% 44.00%
PUERTO RICO | Effect Of Income Subject To Preferential Tax Rate [Member]
       
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract        
Income tax reconciliation, other deductions   (78,132) [1] (1,852) [1] (143,844) [1]
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract        
Effective Income Tax Rate Reconciliation Deductions Other   (36.00%) [1] (1.00%) [1] (59.00%) [1]
PUERTO RICO | Recognition Of Tax Benefits From Previous Years [Member]
       
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract        
Income tax reconciliation, other deductions   $ 0 [2] $ (53,615) [2] $ 0 [2]
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract        
Effective Income Tax Rate Reconciliation Deductions Other   0.00% [2] (20.00%) [2] 0.00% [2]
PUERTO RICO | State Taxes And Others [Member]
       
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract        
Effective Income Tax Rate Reconciliation Deductions Other   2.00% 1.00% (11.00%)
[1] Includes the impact of the Closing Agreement with the P.R. Treasury signed in June 2012 and income from investments in subsidiaries subject to preferential tax rates.
[2] Represents the impact of the Ruling and Closing Agreement with the P.R. Treasury signed in June 2011.