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) (PUERTO RICO, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract
Computed income tax at statutory rates	$ 23,198	$ 94,880	$ (71,939)		$ 51,149
Net benefit of net tax exempt interest income	(12,663)	(7,608)	(37,607)		(27,484)
Deferred tax asset valuation allowance	(3,120)	(2,399)	(17,303)		(5,374)
Non-deductible expenses	90	8,085	178,219		23,844
Difference in tax rates due to multiple jurisdictions	(2,240)	(2,348)	(12,728)		(8,296)
Income Tax Reconciliation Change In Enacted Tax Rate	20,048	0	20,048		(197,467)
Unrecognized Tax Benefits Period Increases Decreases			(3,601)		(7,727)
Income Tax Reconciliation Other Adjustments	8,340	(7,550)	12,658		(2,256)
Income tax (benefit) expense	26,667	17,768	45,807		(276,489)
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract
Computed income tax at statutory rates	39.00%	39.00%	39.00%		39.00%
Effective Income Tax Rate Reconciliation Tax Exempt Income	(21.00%)	(3.00%)	21.00%		(21.00%)
Deferred tax asset valuation allowance	(5.00%)	(1.00%)	9.00%		(4.00%)
Non-deductible expenses	0.00%	3.00%	(97.00%)		18.00%
Difference in tax rates due to multiple jurisdictions	(4.00%)	(1.00%)	7.00%		(6.00%)
Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate	34.00%	0.00%	(11.00%)		(151.00%)
EffectiveIncomeTaxRateReconciliationOtherAdjustments			2.00%		(6.00%)
Income tax (benefit) expense	45.00%	7.00%	(25.00%)		(211.00%)
Effect Of Income Subject To Preferential Tax Rate [Member]
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation Abstract
Income tax reconciliation, other deductions	(3,385)	(57,565)	(21,940)	[1]	(102,878)
Unrecognized Tax Benefits Period Increases Decreases	$ (3,601)	$ (7,727)
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract
Effective Income Tax Rate Reconciliation Deductions Other	(6.00%)	(24.00%)	12.00%	[1]	(78.00%)
EffectiveIncomeTaxRateReconciliationOtherAdjustments	(6.00%)	(3.00%)
State Taxes And Others [Member]
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation Abstract
Effective Income Tax Rate Reconciliation Deductions Other	14.00%	(3.00%)	(7.00%)		(2.00%)

[1] For 2014, includes the impact of the Closing Agreement with the P.R. Treasury signed in June 2014.