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Supplemental Disclosure of Noncash Activities (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Real Estate Owned, Transfer from Real Estate Owned (in Dollars) $ 9.5  
Senior exchangeable notes exchanged for Class A Common Stock (in Shares)   18,305
Stock Issued During Period, Shares, Conversion of Convertible Securities (in Shares)   3,396,102
Noncash or Part Noncash Acquisition, Other Assets Acquired (in Dollars)   $ 0.6