Geographic information (Parenthetical) (Detail) (Fixed Rate 500 Percent Until December 2013 And 900 Percent Thereafter Junior Subordinated Deferrable Interest Debentures With No Stated Maturity [Member], USD $)	3 Months Ended
	Jun. 30, 2014
Segment Reporting Information [Line Items]
Debt Instrument Unamortized Discount And Fee Amount	$ 414,100,000
PUERTO RICO
Segment Reporting Information [Line Items]
Net interest income	$ 119,000,000