Income Taxes - Additional Information (Detail) (USD $)							3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Fixed Rate 700 Percent Notes Due July 2019 [Member]	Dec. 31, 2013 Fixed Rate 700 Percent Notes Due July 2019 [Member]	Jun. 30, 2014 Other Liabilities Member	Dec. 31, 2013 Other Liabilities Member	Jun. 30, 2014 PUERTO RICO	Jun. 30, 2013 PUERTO RICO	Jun. 30, 2014 PUERTO RICO	Jun. 30, 2013 PUERTO RICO	Dec. 31, 2013 PUERTO RICO	Jun. 30, 2014 PUERTO RICO Amendment To The Internal Revenue Code [Member]	Mar. 31, 2014 PUERTO RICO Amendment To The Internal Revenue Code [Member]	Jun. 30, 2014 PUERTO RICO Westernbank Assets Capital Gain Treatment [Member] Closing Agreement with the Puerto Rico Department of Treasury [Member]	Jun. 30, 2014 Parent Company [Member] PUERTO RICO Westernbank Assets Capital Gain Treatment [Member] Closing Agreement with the Puerto Rico Department of Treasury [Member]
Income Taxes [Line Items]
Income Taxes Paid														$ 45,000,000
Marginal Income Tax Rate							39.00%				30.00%
Deferred Tax Assets Net	788,732,000	761,768,000					785,000,000		785,000,000
Unrecognized Tax Benefits Interest On Income Taxes Accrued	4,000,000	3,600,000
Unrecognized Tax Benefits That Would Impact Effective Tax Rate	12,800,000	11,900,000
Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit	7,800,000
Unrecognized Tax Benefits Current Interest On Income Taxes Accrued	425,000	1,400,000
Income Tax Expense Benefit							(4,124,000)	(237,380,000)	19,140,000	(294,257,000)		20,000,000		23,400,000
Deferred Tax Liabilities	132,872,000	135,082,000			35,000,000	2,000,000
Deferred Tax Assets Valuation Allowance	1,224,806,000	1,257,977,000													9,200,000
Capital Gains Tax Rate												20.00%	15.00%
Senior Long Term Notes			450,000,000	0
Income Tax Reconciliation Change In Enacted Tax Rate							$ 0	$ (215,600,000)	$ 0	$ (197,467,000)