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 $) In Millions, unless otherwise specified	Jun. 30, 2014
Fixed Rate 500 Percent Until December 2013 And 900 Percent Thereafter Junior Subordinated Deferrable Interest Debentures With No Stated Maturity [Member]
Segment Reporting Information [Line Items]
Debt Instrument Unamortized Discount And Fee Amount	$ 414.1