Note Guarantees (Other Guarantees) - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Guarantor Obligations
Funds Advanced To Investors Under Servicing Agreements	$ 76.0		$ 31.0
Popular, Inc. Holding Co. | Debt Securities Payable
Guarantor Obligations
Guarantees, unamortized balance of the obligations	200.0	$ 200.0
Financial Standby Letter Of Credit
Guarantor Obligations
Guarantees, unamortized balance of the obligations	0.7	0.5
Guarantee Type, Other | Popular, Inc. Holding Co. | Capital securities (trust preferred securities)
Guarantor Obligations
Guarantees, unamortized balance of the obligations	$ 400.0	$ 400.0